66566742 has 16 divisors (see below), whose sum is σ = 145236672. Its totient is φ = 20171720.

The previous prime is 66566723. The next prime is 66566779. The reversal of 66566742 is 24766566.

It is a super-2 number, since 2×66566742² = 8862262280989128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66566694 and 66566703.

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, 504228 + ... + 504359.

It is an arithmetic number, because the mean of its divisors is an integer number (9077292).

Almost surely, 2^66566742 is an apocalyptic number.

66566742 is an abundant number, since it is smaller than the sum of its proper divisors (78669930).

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

66566742 is a wasteful number, since it uses less digits than its factorization.

66566742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008603.

The product of its digits is 362880, while the sum is 42.

The square root of 66566742 is about 8158.8444034679. The cubic root of 66566742 is about 405.2774444008.

The spelling of 66566742 in words is "sixty-six million, five hundred sixty-six thousand, seven hundred forty-two".