64515623 has 2 divisors, whose sum is σ = 64515624. Its totient is φ = 64515622.

The previous prime is 64515611. The next prime is 64515637. The reversal of 64515623 is 32651546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64515623 - 2⁶ = 64515559 is a prime.

It is a super-2 number, since 2×64515623² = 8324531222156258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64515623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64515223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32257811 + 32257812.

It is an arithmetic number, because the mean of its divisors is an integer number (32257812).

Almost surely, 2^64515623 is an apocalyptic number.

64515623 is a deficient number, since it is larger than the sum of its proper divisors (1).

64515623 is an equidigital number, since it uses as much as digits as its factorization.

64515623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 32.

The square root of 64515623 is about 8032.1617887092. The cubic root of 64515623 is about 401.0713425842.

The spelling of 64515623 in words is "sixty-four million, five hundred fifteen thousand, six hundred twenty-three".