66542024565 has 24 divisors (see below), whose sum is σ = 115495642080. Its totient is φ = 35441038944.

The previous prime is 66542024543. The next prime is 66542024573. The reversal of 66542024565 is 56542024566.

66542024565 is a `hidden beast` number, since 6 + 6 + 542 + 0 + 2 + 45 + 65 = 666.

It is not a de Polignac number, because 66542024565 - 2⁸ = 66542024309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66542024565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 967227 + ... + 1033736.

It is an arithmetic number, because the mean of its divisors is an integer number (4812318420).

Almost surely, 2^66542024565 is an apocalyptic number.

It is an amenable number.

66542024565 is a deficient number, since it is larger than the sum of its proper divisors (48953617515).

66542024565 is a wasteful number, since it uses less digits than its factorization.

66542024565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001713 (or 2001710 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

Subtracting from 66542024565 its reverse (56542024566), we obtain a palindrome (9999999999).

The spelling of 66542024565 in words is "sixty-six billion, five hundred forty-two million, twenty-four thousand, five hundred sixty-five".