66912970 has 16 divisors (see below), whose sum is σ = 120536928. Its totient is φ = 26744400.

The previous prime is 66912961. The next prime is 66912991. The reversal of 66912970 is 7921966.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22045 + ... + 24895.

It is an arithmetic number, because the mean of its divisors is an integer number (7533558).

Almost surely, 2^66912970 is an apocalyptic number.

66912970 is a deficient number, since it is larger than the sum of its proper divisors (53623958).

66912970 is a wasteful number, since it uses less digits than its factorization.

66912970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 66912970 is about 8180.0348410016. The cubic root of 66912970 is about 405.9788748745.

The spelling of 66912970 in words is "sixty-six million, nine hundred twelve thousand, nine hundred seventy".