66712315 has 4 divisors (see below), whose sum is σ = 80054784. Its totient is φ = 53369848.

The previous prime is 66712273. The next prime is 66712337. The reversal of 66712315 is 51321766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51321766 = 2 ⋅25660883.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66712315 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6671227 + ... + 6671236.

It is an arithmetic number, because the mean of its divisors is an integer number (20013696).

Almost surely, 2^66712315 is an apocalyptic number.

66712315 is a deficient number, since it is larger than the sum of its proper divisors (13342469).

66712315 is a wasteful number, since it uses less digits than its factorization.

66712315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13342468.

The product of its digits is 7560, while the sum is 31.

The square root of 66712315 is about 8167.7607090316. The cubic root of 66712315 is about 405.5726593844.

The spelling of 66712315 in words is "sixty-six million, seven hundred twelve thousand, three hundred fifteen".