66670056 has 48 divisors (see below), whose sum is σ = 191189700. Its totient is φ = 20915712.

The previous prime is 66670049. The next prime is 66670063. The reversal of 66670056 is 65007666.

It is an interprime number because it is at equal distance from previous prime (66670049) and next prime (66670063).

It can be written as a sum of positive squares in 2 ways, for example, as 61873956 + 4796100 = 7866^2 + 2190^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66670056.

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, 26011 + ... + 28458.

Almost surely, 2^66670056 is an apocalyptic number.

It is an amenable number.

66670056 is an abundant number, since it is smaller than the sum of its proper divisors (124519644).

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

66670056 is a wasteful number, since it uses less digits than its factorization.

66670056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54498 (or 54491 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 66670056 is about 8165.1733600702. The cubic root of 66670056 is about 405.4870044584.

The spelling of 66670056 in words is "sixty-six million, six hundred seventy thousand, fifty-six".