66891456 has 42 divisors (see below), whose sum is σ = 191733932. Its totient is φ = 22296960.

The previous prime is 66891437. The next prime is 66891463. The reversal of 66891456 is 65419866.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57490 + ... + 58641.

Almost surely, 2^66891456 is an apocalyptic number.

It is an amenable number.

66891456 is an abundant number, since it is smaller than the sum of its proper divisors (124842476).

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

66891456 is a wasteful number, since it uses less digits than its factorization.

66891456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116149 (or 116136 counting only the distinct ones).

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

The square root of 66891456 is about 8178.7197042080. The cubic root of 66891456 is about 405.9353598143.

The spelling of 66891456 in words is "sixty-six million, eight hundred ninety-one thousand, four hundred fifty-six".