66542824565 has 32 divisors (see below), whose sum is σ = 92659200000. Its totient is φ = 44932200768.

The previous prime is 66542824511. The next prime is 66542824567. The reversal of 66542824565 is 56542824566.

It is not a de Polignac number, because 66542824565 - 2⁶ = 66542824501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66542824567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1016186 + ... + 1079684.

It is an arithmetic number, because the mean of its divisors is an integer number (2895600000).

Almost surely, 2^66542824565 is an apocalyptic number.

It is an amenable number.

66542824565 is a deficient number, since it is larger than the sum of its proper divisors (26116375435).

66542824565 is a wasteful number, since it uses less digits than its factorization.

66542824565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63969.

The product of its digits is 13824000, while the sum is 53.

Subtracting from 66542824565 its reverse (56542824566), we obtain a palindrome (9999999999).

The spelling of 66542824565 in words is "sixty-six billion, five hundred forty-two million, eight hundred twenty-four thousand, five hundred sixty-five".