976621126661 has 2 divisors, whose sum is σ = 976621126662. Its totient is φ = 976621126660.

The previous prime is 976621126631. The next prime is 976621126699. The reversal of 976621126661 is 166621126679.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 959800333636 + 16820793025 = 979694^2 + 129695^2 .

It is a cyclic number.

It is not a de Polignac number, because 976621126661 - 2⁶ = 976621126597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (976621126631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488310563330 + 488310563331.

It is an arithmetic number, because the mean of its divisors is an integer number (488310563331).

Almost surely, 2^976621126661 is an apocalyptic number.

It is an amenable number.

976621126661 is a deficient number, since it is larger than the sum of its proper divisors (1).

976621126661 is an equidigital number, since it uses as much as digits as its factorization.

976621126661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The spelling of 976621126661 in words is "nine hundred seventy-six billion, six hundred twenty-one million, one hundred twenty-six thousand, six hundred sixty-one".