66770172 has 36 divisors (see below), whose sum is σ = 192892336. Its totient is φ = 19077120.

The previous prime is 66770159. The next prime is 66770183. The reversal of 66770172 is 27107766.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

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, 132229 + ... + 132732.

Almost surely, 2^66770172 is an apocalyptic number.

It is an amenable number.

66770172 is an abundant number, since it is smaller than the sum of its proper divisors (126122164).

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

66770172 is a wasteful number, since it uses less digits than its factorization.

66770172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264978 (or 264973 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 66770172 is about 8171.3017322823. The cubic root of 66770172 is about 405.6898713121.

The spelling of 66770172 in words is "sixty-six million, seven hundred seventy thousand, one hundred seventy-two".