65664226406631 has 16 divisors (see below), whose sum is σ = 87938858821248. Its totient is φ = 43582876255200.

The previous prime is 65664226406621. The next prime is 65664226406657. The reversal of 65664226406631 is 13660462246656.

It is a happy number.

It is not a de Polignac number, because 65664226406631 - 2²¹ = 65664224309479 is a prime.

It is a super-2 number, since 2×65664226406631² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65664226406621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78567376 + ... + 79398746.

It is an arithmetic number, because the mean of its divisors is an integer number (5496178676328).

Almost surely, 2^{65664226406631} is an apocalyptic number.

65664226406631 is a deficient number, since it is larger than the sum of its proper divisors (22274632414617).

65664226406631 is a wasteful number, since it uses less digits than its factorization.

65664226406631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947582.

The product of its (nonzero) digits is 44789760, while the sum is 57.

The spelling of 65664226406631 in words is "sixty-five trillion, six hundred sixty-four billion, two hundred twenty-six million, four hundred six thousand, six hundred thirty-one".