977145157989 has 320 divisors, whose sum is σ = 1998011473920. Its totient is φ = 459514944000.

The previous prime is 977145157981. The next prime is 977145157999. The reversal of 977145157989 is 989751541779.

977145157989 is a `hidden beast` number, since 9 + 7 + 7 + 1 + 45 + 1 + 579 + 8 + 9 = 666.

977145157989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 977145157989 - 2³ = 977145157981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977145157981) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 1548565704 + ... + 1548566334.

It is an arithmetic number, because the mean of its divisors is an integer number (6243785856).

Almost surely, 2^977145157989 is an apocalyptic number.

977145157989 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

977145157989 is an abundant number, since it is smaller than the sum of its proper divisors (1020866315931).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

977145157989 is a wasteful number, since it uses less digits than its factorization.

977145157989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014 (or 1005 counting only the distinct ones).

The product of its digits is 200037600, while the sum is 72.

It can be divided in two parts, 9771 and 45157989, that added together give a triangular number (45167760 = T₉₅₀₄).

The spelling of 977145157989 in words is "nine hundred seventy-seven billion, one hundred forty-five million, one hundred fifty-seven thousand, nine hundred eighty-nine".