66515762519 has 2 divisors, whose sum is σ = 66515762520. Its totient is φ = 66515762518.

The previous prime is 66515762501. The next prime is 66515762527. The reversal of 66515762519 is 91526751566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66515762519 - 2⁸ = 66515762263 is a prime.

It is a super-2 number, since 2×66515762519² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66515764519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33257881259 + 33257881260.

It is an arithmetic number, because the mean of its divisors is an integer number (33257881260).

Almost surely, 2^66515762519 is an apocalyptic number.

66515762519 is a deficient number, since it is larger than the sum of its proper divisors (1).

66515762519 is an equidigital number, since it uses as much as digits as its factorization.

66515762519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402000, while the sum is 53.

The spelling of 66515762519 in words is "sixty-six billion, five hundred fifteen million, seven hundred sixty-two thousand, five hundred nineteen".