77476660997 has 2 divisors, whose sum is σ = 77476660998. Its totient is φ = 77476660996.

The previous prime is 77476660993. The next prime is 77476661051. The reversal of 77476660997 is 79906667477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77220628996 + 256032001 = 277886^2 + 16001^2 .

It is a cyclic number.

It is not a de Polignac number, because 77476660997 - 2² = 77476660993 is a prime.

It is a super-2 number, since 2×77476660997² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77476660993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38738330498 + 38738330499.

It is an arithmetic number, because the mean of its divisors is an integer number (38738330499).

Almost surely, 2^77476660997 is an apocalyptic number.

It is an amenable number.

77476660997 is a deficient number, since it is larger than the sum of its proper divisors (1).

77476660997 is an equidigital number, since it uses as much as digits as its factorization.

77476660997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168031584, while the sum is 68.

The spelling of 77476660997 in words is "seventy-seven billion, four hundred seventy-six million, six hundred sixty thousand, nine hundred ninety-seven".