9977557987 has 4 divisors (see below), whose sum is σ = 10411364880. Its totient is φ = 9543751096.

The previous prime is 9977557969. The next prime is 9977558039. The reversal of 9977557987 is 7897557799.

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

It is a cyclic number.

It is not a de Polignac number, because 9977557987 - 2¹⁵ = 9977525219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9977557927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216903412 + ... + 216903457.

It is an arithmetic number, because the mean of its divisors is an integer number (2602841220).

Almost surely, 2^9977557987 is an apocalyptic number.

9977557987 is a deficient number, since it is larger than the sum of its proper divisors (433806893).

9977557987 is a wasteful number, since it uses less digits than its factorization.

9977557987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433806892.

The product of its digits is 350065800, while the sum is 73.

The square root of 9977557987 is about 99887.7269087649. The cubic root of 9977557987 is about 2152.8218211847.

The spelling of 9977557987 in words is "nine billion, nine hundred seventy-seven million, five hundred fifty-seven thousand, nine hundred eighty-seven".