66566140465 has 16 divisors (see below), whose sum is σ = 87233215680. Its totient is φ = 48360579520.

The previous prime is 66566140451. The next prime is 66566140477. The reversal of 66566140465 is 56404166566.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-66566140465 is a prime.

It is a super-2 number, since 2×66566140465² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 586930 + ... + 691099.

It is an arithmetic number, because the mean of its divisors is an integer number (5452075980).

Almost surely, 2^66566140465 is an apocalyptic number.

It is an amenable number.

66566140465 is a deficient number, since it is larger than the sum of its proper divisors (20667075215).

66566140465 is a wasteful number, since it uses less digits than its factorization.

66566140465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278992.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 66566140465 in words is "sixty-six billion, five hundred sixty-six million, one hundred forty thousand, four hundred sixty-five".