66511701631 has 2 divisors, whose sum is σ = 66511701632. Its totient is φ = 66511701630.

The previous prime is 66511701547. The next prime is 66511701671. The reversal of 66511701631 is 13610711566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66511701631 - 2¹³ = 66511693439 is a prime.

It is a super-2 number, since 2×66511701631² (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 (66511701671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33255850815 + 33255850816.

It is an arithmetic number, because the mean of its divisors is an integer number (33255850816).

Almost surely, 2^66511701631 is an apocalyptic number.

66511701631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66511701631 is an equidigital number, since it uses as much as digits as its factorization.

66511701631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 66511701631 in words is "sixty-six billion, five hundred eleven million, seven hundred one thousand, six hundred thirty-one".