66442511531 has 4 divisors (see below), whose sum is σ = 72482739864. Its totient is φ = 60402283200.

The previous prime is 66442511489. The next prime is 66442511537. The reversal of 66442511531 is 13511524466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66442511531 - 2²² = 66438317227 is a prime.

It is a super-2 number, since 2×66442511531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66442511537) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3020114150 + ... + 3020114171.

It is an arithmetic number, because the mean of its divisors is an integer number (18120684966).

Almost surely, 2^66442511531 is an apocalyptic number.

66442511531 is a deficient number, since it is larger than the sum of its proper divisors (6040228333).

66442511531 is a wasteful number, since it uses less digits than its factorization.

66442511531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6040228332.

The product of its digits is 86400, while the sum is 38.

The spelling of 66442511531 in words is "sixty-six billion, four hundred forty-two million, five hundred eleven thousand, five hundred thirty-one".