66719207534 has 16 divisors (see below), whose sum is σ = 116314358400. Its totient is φ = 28109302584.

The previous prime is 66719207509. The next prime is 66719207567. The reversal of 66719207534 is 43570291766.

It is a super-2 number, since 2×66719207534² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40386104 + ... + 40387755.

It is an arithmetic number, because the mean of its divisors is an integer number (7269647400).

Almost surely, 2^66719207534 is an apocalyptic number.

66719207534 is a deficient number, since it is larger than the sum of its proper divisors (49595150866).

66719207534 is a wasteful number, since it uses less digits than its factorization.

66719207534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80773927.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The spelling of 66719207534 in words is "sixty-six billion, seven hundred nineteen million, two hundred seven thousand, five hundred thirty-four".