66215745883564 has 6 divisors (see below), whose sum is σ = 115877555296244. Its totient is φ = 33107872941780.

The previous prime is 66215745883561. The next prime is 66215745883591. The reversal of 66215745883564 is 46538854751266.

It is a super-2 number, since 2×66215745883564² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66215745883493 and 66215745883502.

It is not an unprimeable number, because it can be changed into a prime (66215745883561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8276968235442 + ... + 8276968235449.

Almost surely, 2^{66215745883564} is an apocalyptic number.

It is an amenable number.

66215745883564 is a deficient number, since it is larger than the sum of its proper divisors (49661809412680).

66215745883564 is a wasteful number, since it uses less digits than its factorization.

66215745883564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16553936470895 (or 16553936470893 counting only the distinct ones).

The product of its digits is 1161216000, while the sum is 70.

The spelling of 66215745883564 in words is "sixty-six trillion, two hundred fifteen billion, seven hundred forty-five million, eight hundred eighty-three thousand, five hundred sixty-four".