66607500731 has 2 divisors, whose sum is σ = 66607500732. Its totient is φ = 66607500730.

The previous prime is 66607500721. The next prime is 66607500761. The reversal of 66607500731 is 13700570666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66607500731 - 2¹⁴ = 66607484347 is a prime.

It is a super-2 number, since 2×66607500731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66607500721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33303750365 + 33303750366.

It is an arithmetic number, because the mean of its divisors is an integer number (33303750366).

Almost surely, 2^66607500731 is an apocalyptic number.

66607500731 is a deficient number, since it is larger than the sum of its proper divisors (1).

66607500731 is an equidigital number, since it uses as much as digits as its factorization.

66607500731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 41.

The spelling of 66607500731 in words is "sixty-six billion, six hundred seven million, five hundred thousand, seven hundred thirty-one".