66916770 has 32 divisors (see below), whose sum is σ = 160997760. Its totient is φ = 17800320.

The previous prime is 66916769. The next prime is 66916771. The reversal of 66916770 is 7761966.

It is an interprime number because it is at equal distance from previous prime (66916769) and next prime (66916771).

It is not an unprimeable number, because it can be changed into a prime (66916771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10630 + ... + 15710.

It is an arithmetic number, because the mean of its divisors is an integer number (5031180).

Almost surely, 2^66916770 is an apocalyptic number.

66916770 is an abundant number, since it is smaller than the sum of its proper divisors (94080990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66916770 is a wasteful number, since it uses less digits than its factorization.

66916770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 66916770 is about 8180.2671105533. The cubic root of 66916770 is about 405.9865599343.

The spelling of 66916770 in words is "sixty-six million, nine hundred sixteen thousand, seven hundred seventy".