66515762551 has 4 divisors (see below), whose sum is σ = 76018014352. Its totient is φ = 57013510752.

The previous prime is 66515762527. The next prime is 66515762597. The reversal of 66515762551 is 15526751566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66515762551 - 2⁵ = 66515762519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66515762495 and 66515762504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66515762501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4751125890 + ... + 4751125903.

It is an arithmetic number, because the mean of its divisors is an integer number (19004503588).

Almost surely, 2^66515762551 is an apocalyptic number.

66515762551 is a deficient number, since it is larger than the sum of its proper divisors (9502251801).

66515762551 is an equidigital number, since it uses as much as digits as its factorization.

66515762551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9502251800.

The product of its digits is 1890000, while the sum is 49.

The spelling of 66515762551 in words is "sixty-six billion, five hundred fifteen million, seven hundred sixty-two thousand, five hundred fifty-one".