69340864721 has 2 divisors, whose sum is σ = 69340864722. Its totient is φ = 69340864720.

The previous prime is 69340864679. The next prime is 69340864741. The reversal of 69340864721 is 12746804396.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61682689600 + 7658175121 = 248360^2 + 87511^2 .

It is a cyclic number.

It is not a de Polignac number, because 69340864721 - 2⁶ = 69340864657 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 69340864721.

It is not a weakly prime, because it can be changed into another prime (69340864741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34670432360 + 34670432361.

It is an arithmetic number, because the mean of its divisors is an integer number (34670432361).

Almost surely, 2^69340864721 is an apocalyptic number.

It is an amenable number.

69340864721 is a deficient number, since it is larger than the sum of its proper divisors (1).

69340864721 is an equidigital number, since it uses as much as digits as its factorization.

69340864721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 69340864721 in words is "sixty-nine billion, three hundred forty million, eight hundred sixty-four thousand, seven hundred twenty-one".