79815940961 has 2 divisors, whose sum is σ = 79815940962. Its totient is φ = 79815940960.

The previous prime is 79815940949. The next prime is 79815940973. The reversal of 79815940961 is 16904951897.

It is a balanced prime because it is at equal distance from previous prime (79815940949) and next prime (79815940973).

It can be written as a sum of positive squares in only one way, i.e., 62692648225 + 17123292736 = 250385^2 + 130856^2 .

It is a cyclic number.

It is not a de Polignac number, because 79815940961 - 2²² = 79811746657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79815940961.

It is not a weakly prime, because it can be changed into another prime (79815900961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39907970480 + 39907970481.

It is an arithmetic number, because the mean of its divisors is an integer number (39907970481).

Almost surely, 2^79815940961 is an apocalyptic number.

It is an amenable number.

79815940961 is a deficient number, since it is larger than the sum of its proper divisors (1).

79815940961 is an equidigital number, since it uses as much as digits as its factorization.

79815940961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 59.

The spelling of 79815940961 in words is "seventy-nine billion, eight hundred fifteen million, nine hundred forty thousand, nine hundred sixty-one".