66313215 has 32 divisors (see below), whose sum is σ = 118276800. Its totient is φ = 35251200.

The previous prime is 66313201. The next prime is 66313217. The reversal of 66313215 is 51231366.

66313215 is a `hidden beast` number, since 6 + 631 + 3 + 21 + 5 = 666.

It is not a de Polignac number, because 66313215 - 2⁷ = 66313087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66313217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54615 + ... + 55815.

It is an arithmetic number, because the mean of its divisors is an integer number (3696150).

Almost surely, 2^66313215 is an apocalyptic number.

66313215 is a deficient number, since it is larger than the sum of its proper divisors (51963585).

66313215 is a wasteful number, since it uses less digits than its factorization.

66313215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624 (or 1618 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 66313215 is about 8143.2926387304. The cubic root of 66313215 is about 404.7622747544.

The spelling of 66313215 in words is "sixty-six million, three hundred thirteen thousand, two hundred fifteen".