15640064513 has 2 divisors, whose sum is σ = 15640064514. Its totient is φ = 15640064512.

The previous prime is 15640064509. The next prime is 15640064543. The reversal of 15640064513 is 31546004651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13995599809 + 1644464704 = 118303^2 + 40552^2 .

It is a cyclic number.

It is not a de Polignac number, because 15640064513 - 2² = 15640064509 is a prime.

It is a super-2 number, since 2×15640064513² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15640064543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7820032256 + 7820032257.

It is an arithmetic number, because the mean of its divisors is an integer number (7820032257).

Almost surely, 2^15640064513 is an apocalyptic number.

It is an amenable number.

15640064513 is a deficient number, since it is larger than the sum of its proper divisors (1).

15640064513 is an equidigital number, since it uses as much as digits as its factorization.

15640064513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 15640064513 in words is "fifteen billion, six hundred forty million, sixty-four thousand, five hundred thirteen".