66916458 has 36 divisors (see below), whose sum is σ = 168659010. Its totient is φ = 19118736.

The previous prime is 66916429. The next prime is 66916463. The reversal of 66916458 is 85461966.

It can be written as a sum of positive squares in only one way, i.e., 53100369 + 13816089 = 7287^2 + 3717^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 37053 + ... + 38816.

Almost surely, 2^66916458 is an apocalyptic number.

66916458 is an abundant number, since it is smaller than the sum of its proper divisors (101742552).

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

66916458 is a wasteful number, since it uses less digits than its factorization.

66916458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75891 (or 75881 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 66916458 is about 8180.2480402491. The cubic root of 66916458 is about 405.9859289614.

The spelling of 66916458 in words is "sixty-six million, nine hundred sixteen thousand, four hundred fifty-eight".