977655443321 has 4 divisors (see below), whose sum is σ = 982039548672. Its totient is φ = 973271337972.

The previous prime is 977655443311. The next prime is 977655443327. The reversal of 977655443321 is 123344556779.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123344556779 = 35111 ⋅3512989.

It is a cyclic number.

It is not a de Polignac number, because 977655443321 - 2¹⁸ = 977655181177 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (977655443327) 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, 2192052341 + ... + 2192052786.

It is an arithmetic number, because the mean of its divisors is an integer number (245509887168).

Almost surely, 2^977655443321 is an apocalyptic number.

It is an amenable number.

977655443321 is a deficient number, since it is larger than the sum of its proper divisors (4384105351).

977655443321 is a wasteful number, since it uses less digits than its factorization.

977655443321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384105350.

The product of its digits is 19051200, while the sum is 56.

The spelling of 977655443321 in words is "nine hundred seventy-seven billion, six hundred fifty-five million, four hundred forty-three thousand, three hundred twenty-one".