977863197809 has 6 divisors (see below), whose sum is σ = 1038768172374. Its totient is φ = 920341832960.

The previous prime is 977863197799. The next prime is 977863197821. The reversal of 977863197809 is 908791368779.

It can be written as a sum of positive squares in 3 ways, for example, as 127174258225 + 850688939584 = 356615^2 + 922328^2 .

It is a de Polignac number, because none of the positive numbers 2^k-977863197809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977863197869) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1691804552 + ... + 1691805129.

It is an arithmetic number, because the mean of its divisors is an integer number (173128028729).

Almost surely, 2^977863197809 is an apocalyptic number.

It is an amenable number.

977863197809 is a deficient number, since it is larger than the sum of its proper divisors (60904974565).

977863197809 is a wasteful number, since it uses less digits than its factorization.

977863197809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383609715 (or 3383609698 counting only the distinct ones).

The product of its (nonzero) digits is 288054144, while the sum is 74.

The spelling of 977863197809 in words is "nine hundred seventy-seven billion, eight hundred sixty-three million, one hundred ninety-seven thousand, eight hundred nine".