66955554 has 24 divisors (see below), whose sum is σ = 153604620. Its totient is φ = 21005568.

The previous prime is 66955549. The next prime is 66955561. The reversal of 66955554 is 45555966.

66955554 is a `hidden beast` number, since 6 + 6 + 95 + 5 + 554 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 65173329 + 1782225 = 8073^2 + 1335^2 .

It is a super-2 number, since 2×66955554² = 8966092422893832, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109099 + ... + 109710.

Almost surely, 2^66955554 is an apocalyptic number.

66955554 is an abundant number, since it is smaller than the sum of its proper divisors (86649066).

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

66955554 is a wasteful number, since it uses less digits than its factorization.

66955554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218834 (or 218831 counting only the distinct ones).

The product of its digits is 810000, while the sum is 45.

The square root of 66955554 is about 8182.6373499013. The cubic root of 66955554 is about 406.0649794481.

The spelling of 66955554 in words is "sixty-six million, nine hundred fifty-five thousand, five hundred fifty-four".