9866955157 has 4 divisors (see below), whose sum is σ = 10207195020. Its totient is φ = 9526715296.

The previous prime is 9866955149. The next prime is 9866955167. The reversal of 9866955157 is 7515596689.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1594325041 + 8272630116 = 39929^2 + 90954^2 .

It is not a de Polignac number, because 9866955157 - 2³ = 9866955149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9866955095 and 9866955104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9866955167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170119888 + ... + 170119945.

It is an arithmetic number, because the mean of its divisors is an integer number (2551798755).

Almost surely, 2^9866955157 is an apocalyptic number.

It is an amenable number.

9866955157 is a deficient number, since it is larger than the sum of its proper divisors (340239863).

9866955157 is a wasteful number, since it uses less digits than its factorization.

9866955157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340239862.

The product of its digits is 20412000, while the sum is 61.

The square root of 9866955157 is about 99332.5483263165. The cubic root of 9866955157 is about 2144.8374537546.

The spelling of 9866955157 in words is "nine billion, eight hundred sixty-six million, nine hundred fifty-five thousand, one hundred fifty-seven".