9918977157 has 6 divisors (see below), whose sum is σ = 14327411462. Its totient is φ = 6612651432.

The previous prime is 9918977153. The next prime is 9918977161. The reversal of 9918977157 is 7517798199.

9918977157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9918977153) and next prime (9918977161).

It can be written as a sum of positive squares in only one way, i.e., 9918964836 + 12321 = 99594^2 + 111^2 .

It is not a de Polignac number, because 9918977157 - 2² = 9918977153 is a prime.

It is a super-2 number, since 2×9918977157² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9918977094 and 9918977103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9918977153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 551054278 + ... + 551054295.

Almost surely, 2^9918977157 is an apocalyptic number.

It is an amenable number.

9918977157 is a deficient number, since it is larger than the sum of its proper divisors (4408434305).

9918977157 is a wasteful number, since it uses less digits than its factorization.

9918977157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102108579 (or 1102108576 counting only the distinct ones).

The product of its digits is 10001880, while the sum is 63.

The square root of 9918977157 is about 99594.0618561167. The cubic root of 9918977157 is about 2148.6002901014.

The spelling of 9918977157 in words is "nine billion, nine hundred eighteen million, nine hundred seventy-seven thousand, one hundred fifty-seven".