66624765 has 16 divisors (see below), whose sum is σ = 106887168. Its totient is φ = 35437376.

The previous prime is 66624739. The next prime is 66624787. The reversal of 66624765 is 56742666.

It is a cyclic number.

It is not a de Polignac number, because 66624765 - 2¹³ = 66616573 is a prime.

It is a super-2 number, since 2×66624765² = 8877718622610450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54 + ... + 11543.

It is an arithmetic number, because the mean of its divisors is an integer number (6680448).

Almost surely, 2^66624765 is an apocalyptic number.

It is an amenable number.

66624765 is a deficient number, since it is larger than the sum of its proper divisors (40262403).

66624765 is a wasteful number, since it uses less digits than its factorization.

66624765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11988.

The product of its digits is 362880, while the sum is 42.

The square root of 66624765 is about 8162.3994633931. The cubic root of 66624765 is about 405.3951637671.

The spelling of 66624765 in words is "sixty-six million, six hundred twenty-four thousand, seven hundred sixty-five".