977385155885 has 4 divisors (see below), whose sum is σ = 1172862187068. Its totient is φ = 781908124704.

The previous prime is 977385155869. The next prime is 977385155891. The reversal of 977385155885 is 588551583779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588551583779 = 52189 ⋅11277311.

It can be written as a sum of positive squares in 2 ways, for example, as 436611706756 + 540773449129 = 660766^2 + 735373^2 .

It is a cyclic number.

It is not a de Polignac number, because 977385155885 - 2⁴ = 977385155869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97738515584 + ... + 97738515593.

It is an arithmetic number, because the mean of its divisors is an integer number (293215546767).

Almost surely, 2^977385155885 is an apocalyptic number.

It is an amenable number.

977385155885 is a deficient number, since it is larger than the sum of its proper divisors (195477031183).

977385155885 is a wasteful number, since it uses less digits than its factorization.

977385155885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195477031182.

The product of its digits is 423360000, while the sum is 71.

The spelling of 977385155885 in words is "nine hundred seventy-seven billion, three hundred eighty-five million, one hundred fifty-five thousand, eight hundred eighty-five".