69426379721 has 2 divisors, whose sum is σ = 69426379722. Its totient is φ = 69426379720.

The previous prime is 69426379703. The next prime is 69426379751. The reversal of 69426379721 is 12797362496.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54477894025 + 14948485696 = 233405^2 + 122264^2 .

It is a cyclic number.

It is not a de Polignac number, because 69426379721 - 2⁶ = 69426379657 is a prime.

It is not a weakly prime, because it can be changed into another prime (69426379751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34713189860 + 34713189861.

It is an arithmetic number, because the mean of its divisors is an integer number (34713189861).

Almost surely, 2^69426379721 is an apocalyptic number.

It is an amenable number.

69426379721 is a deficient number, since it is larger than the sum of its proper divisors (1).

69426379721 is an equidigital number, since it uses as much as digits as its factorization.

69426379721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 56.

The spelling of 69426379721 in words is "sixty-nine billion, four hundred twenty-six million, three hundred seventy-nine thousand, seven hundred twenty-one".