66772975 has 18 divisors (see below), whose sum is σ = 85140384. Its totient is φ = 51948000.

The previous prime is 66772967. The next prime is 66772997. The reversal of 66772975 is 57927766.

It is a happy number.

It is not a de Polignac number, because 66772975 - 2³ = 66772967 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 33250 + ... + 35200.

Almost surely, 2^66772975 is an apocalyptic number.

66772975 is a deficient number, since it is larger than the sum of its proper divisors (18367409).

66772975 is a wasteful number, since it uses less digits than its factorization.

66772975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035 (or 1993 counting only the distinct ones).

The product of its digits is 1111320, while the sum is 49.

The square root of 66772975 is about 8171.4732453824. The cubic root of 66772975 is about 405.6955481624.

The spelling of 66772975 in words is "sixty-six million, seven hundred seventy-two thousand, nine hundred seventy-five".