66800475 has 108 divisors (see below), whose sum is σ = 142787736. Its totient is φ = 29756160.

The previous prime is 66800423. The next prime is 66800479. The reversal of 66800475 is 57400866.

It is a happy number.

It is not a de Polignac number, because 66800475 - 2⁷ = 66800347 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66800479) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 804784 + ... + 804866.

Almost surely, 2^66800475 is an apocalyptic number.

66800475 is an abundant number, since it is smaller than the sum of its proper divisors (75987261).

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

66800475 is a wasteful number, since it uses less digits than its factorization.

66800475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 66800475 is about 8173.1557552759. The cubic root of 66800475 is about 405.7512348446.

The spelling of 66800475 in words is "sixty-six million, eight hundred thousand, four hundred seventy-five".