66465515 has 24 divisors (see below), whose sum is σ = 87892128. Its totient is φ = 48153600.

The previous prime is 66465493. The next prime is 66465521. The reversal of 66465515 is 51556466.

It is not a de Polignac number, because 66465515 - 2¹² = 66461419 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40715 + ... + 42315.

It is an arithmetic number, because the mean of its divisors is an integer number (3662172).

Almost surely, 2^66465515 is an apocalyptic number.

66465515 is a deficient number, since it is larger than the sum of its proper divisors (21426613).

66465515 is a wasteful number, since it uses less digits than its factorization.

66465515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1648 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 66465515 is about 8152.6385299484. The cubic root of 66465515 is about 405.0719071631.

The spelling of 66465515 in words is "sixty-six million, four hundred sixty-five thousand, five hundred fifteen".