66651654 has 32 divisors (see below), whose sum is σ = 139636224. Its totient is φ = 21169280.

The previous prime is 66651653. The next prime is 66651659. The reversal of 66651654 is 45615666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66651653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42142 + ... + 43694.

It is an arithmetic number, because the mean of its divisors is an integer number (4363632).

Almost surely, 2^66651654 is an apocalyptic number.

66651654 is an abundant number, since it is smaller than the sum of its proper divisors (72984570).

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

66651654 is a wasteful number, since it uses less digits than its factorization.

66651654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892.

The product of its digits is 129600, while the sum is 39.

The square root of 66651654 is about 8164.0464231899. The cubic root of 66651654 is about 405.4496940629.

The spelling of 66651654 in words is "sixty-six million, six hundred fifty-one thousand, six hundred fifty-four".