977666555420 has 96 divisors (see below), whose sum is σ = 2241770065920. Its totient is φ = 357037908480.

The previous prime is 977666555413. The next prime is 977666555471. The reversal of 977666555420 is 24555666779.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 571391 + ... + 1510569.

It is an arithmetic number, because the mean of its divisors is an integer number (23351771520).

Almost surely, 2^977666555420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 977666555420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120885032960).

977666555420 is an abundant number, since it is smaller than the sum of its proper divisors (1264103510500).

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

977666555420 is a wasteful number, since it uses less digits than its factorization.

977666555420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939315 (or 939313 counting only the distinct ones).

The product of its (nonzero) digits is 95256000, while the sum is 62.

The spelling of 977666555420 in words is "nine hundred seventy-seven billion, six hundred sixty-six million, five hundred fifty-five thousand, four hundred twenty".