66625015 has 8 divisors (see below), whose sum is σ = 80174880. Its totient is φ = 53150112.

The previous prime is 66625007. The next prime is 66625037. The reversal of 66625015 is 51052666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66625015 - 2³ = 66625007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16764 + ... + 20353.

It is an arithmetic number, because the mean of its divisors is an integer number (10021860).

Almost surely, 2^66625015 is an apocalyptic number.

66625015 is a deficient number, since it is larger than the sum of its proper divisors (13549865).

66625015 is a wasteful number, since it uses less digits than its factorization.

66625015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37481.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 66625015 is about 8162.4147775030. The cubic root of 66625015 is about 405.3956708291.

The spelling of 66625015 in words is "sixty-six million, six hundred twenty-five thousand, fifteen".