65166720 has 64 divisors (see below), whose sum is σ = 207725040. Its totient is φ = 17377280.

The previous prime is 65166709. The next prime is 65166721. The reversal of 65166720 is 2766156.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65166721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15051 + ... + 18890.

Almost surely, 2^65166720 is an apocalyptic number.

65166720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65166720 is an abundant number, since it is smaller than the sum of its proper divisors (142558320).

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

65166720 is a wasteful number, since it uses less digits than its factorization.

65166720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33963 (or 33951 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 65166720 is about 8072.5906622348. The cubic root of 65166720 is about 402.4160441123.

The spelling of 65166720 in words is "sixty-five million, one hundred sixty-six thousand, seven hundred twenty".