66846520 has 32 divisors (see below), whose sum is σ = 161975520. Its totient is φ = 24681600.

The previous prime is 66846511. The next prime is 66846557. The reversal of 66846520 is 2564866.

It is a super-2 number, since 2×66846520² = 8936914472220800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66846520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63756 + ... + 64795.

It is an arithmetic number, because the mean of its divisors is an integer number (5061735).

Almost surely, 2^66846520 is an apocalyptic number.

It is an amenable number.

66846520 is an abundant number, since it is smaller than the sum of its proper divisors (95129000).

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

66846520 is a wasteful number, since it uses less digits than its factorization.

66846520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128575 (or 128571 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 66846520 is about 8175.9721134554. The cubic root of 66846520 is about 405.8444403925.

The spelling of 66846520 in words is "sixty-six million, eight hundred forty-six thousand, five hundred twenty".