15790834721 has 2 divisors, whose sum is σ = 15790834722. Its totient is φ = 15790834720.

The previous prime is 15790834651. The next prime is 15790834739. The reversal of 15790834721 is 12743809751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14565834721 + 1225000000 = 120689^2 + 35000^2 .

It is a cyclic number.

It is not a de Polignac number, because 15790834721 - 2²² = 15786640417 is a prime.

It is a super-2 number, since 2×15790834721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15790834771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7895417360 + 7895417361.

It is an arithmetic number, because the mean of its divisors is an integer number (7895417361).

Almost surely, 2^15790834721 is an apocalyptic number.

It is an amenable number.

15790834721 is a deficient number, since it is larger than the sum of its proper divisors (1).

15790834721 is an equidigital number, since it uses as much as digits as its factorization.

15790834721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 15790834721 in words is "fifteen billion, seven hundred ninety million, eight hundred thirty-four thousand, seven hundred twenty-one".