66975175 has 12 divisors (see below), whose sum is σ = 83190856. Its totient is φ = 53488800.

The previous prime is 66975163. The next prime is 66975193. The reversal of 66975175 is 57157966.

It is a happy number.

It is not a de Polignac number, because 66975175 - 2¹³ = 66966983 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 15337 + ... + 19213.

Almost surely, 2^66975175 is an apocalyptic number.

66975175 is a deficient number, since it is larger than the sum of its proper divisors (16215681).

66975175 is a wasteful number, since it uses less digits than its factorization.

66975175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578 (or 4573 counting only the distinct ones).

The product of its digits is 396900, while the sum is 46.

The square root of 66975175 is about 8183.8362031507. The cubic root of 66975175 is about 406.1046406977.

It can be divided in two parts, 6697 and 5175, that multiplied together give a triangular number (34656975 = T₈₃₂₅).

The spelling of 66975175 in words is "sixty-six million, nine hundred seventy-five thousand, one hundred seventy-five".