66515762495 has 64 divisors (see below), whose sum is σ = 105162624000. Its totient is φ = 39210034176.

The previous prime is 66515762407. The next prime is 66515762497. The reversal of 66515762495 is 59426751566.

It is a cyclic number.

It is not a de Polignac number, because 66515762495 - 2³² = 62220795199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66515762495.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66515762497) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 444851 + ... + 575259.

It is an arithmetic number, because the mean of its divisors is an integer number (1643166000).

Almost surely, 2^66515762495 is an apocalyptic number.

66515762495 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66515762495 is a deficient number, since it is larger than the sum of its proper divisors (38646861505).

66515762495 is a wasteful number, since it uses less digits than its factorization.

66515762495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130512.

The product of its digits is 13608000, while the sum is 56.

The spelling of 66515762495 in words is "sixty-six billion, five hundred fifteen million, seven hundred sixty-two thousand, four hundred ninety-five".