66511581677331 has 32 divisors (see below), whose sum is σ = 101599832632320. Its totient is φ = 37913397387264.

The previous prime is 66511581677243. The next prime is 66511581677447. The reversal of 66511581677331 is 13377618511566.

It is not a de Polignac number, because 66511581677331 - 2¹⁸ = 66511581415187 is a prime.

It is a super-2 number, since 2×66511581677331² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66511581673331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14176755 + ... + 18275763.

It is an arithmetic number, because the mean of its divisors is an integer number (3174994769760).

Almost surely, 2^{66511581677331} is an apocalyptic number.

66511581677331 is a deficient number, since it is larger than the sum of its proper divisors (35088250954989).

66511581677331 is a wasteful number, since it uses less digits than its factorization.

66511581677331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100915.

The product of its digits is 19051200, while the sum is 60.

The spelling of 66511581677331 in words is "sixty-six trillion, five hundred eleven billion, five hundred eighty-one million, six hundred seventy-seven thousand, three hundred thirty-one".