66670515 has 24 divisors (see below), whose sum is σ = 122361408. Its totient is φ = 33465600.

The previous prime is 66670501. The next prime is 66670529. The reversal of 66670515 is 51507666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66670501) and next prime (66670529).

It is not a de Polignac number, because 66670515 - 2¹² = 66666419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66670515.

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, 42811 + ... + 44340.

It is an arithmetic number, because the mean of its divisors is an integer number (5098392).

Almost surely, 2^66670515 is an apocalyptic number.

66670515 is a deficient number, since it is larger than the sum of its proper divisors (55690893).

66670515 is a wasteful number, since it uses less digits than its factorization.

66670515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87179 (or 87176 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 66670515 is about 8165.2014672021. The cubic root of 66670515 is about 405.4879350017.

The spelling of 66670515 in words is "sixty-six million, six hundred seventy thousand, five hundred fifteen".