15321520651 has 2 divisors, whose sum is σ = 15321520652. Its totient is φ = 15321520650.

The previous prime is 15321520649. The next prime is 15321520703. The reversal of 15321520651 is 15602512351.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15321520651 - 2¹ = 15321520649 is a prime.

Together with 15321520649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15321520601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7660760325 + 7660760326.

It is an arithmetic number, because the mean of its divisors is an integer number (7660760326).

Almost surely, 2^15321520651 is an apocalyptic number.

15321520651 is a deficient number, since it is larger than the sum of its proper divisors (1).

15321520651 is an equidigital number, since it uses as much as digits as its factorization.

15321520651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 15321520651 in words is "fifteen billion, three hundred twenty-one million, five hundred twenty thousand, six hundred fifty-one".