1976831999957 has 2 divisors, whose sum is σ = 1976831999958. Its totient is φ = 1976831999956.

The previous prime is 1976831999939. The next prime is 1976831999963. The reversal of 1976831999957 is 7599991386791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1964891848516 + 11940151441 = 1401746^2 + 109271^2 .

It is an emirp because it is prime and its reverse (7599991386791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1976831999957 - 2¹⁸ = 1976831737813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1976831999917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988415999978 + 988415999979.

It is an arithmetic number, because the mean of its divisors is an integer number (988415999979).

Almost surely, 2^{1976831999957} is an apocalyptic number.

It is an amenable number.

1976831999957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1976831999957 is an equidigital number, since it uses as much as digits as its factorization.

1976831999957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2083248720, while the sum is 83.

The spelling of 1976831999957 in words is "one trillion, nine hundred seventy-six billion, eight hundred thirty-one million, nine hundred ninety-nine thousand, nine hundred fifty-seven".