65401521612631 has 4 divisors (see below), whose sum is σ = 65401587939600. Its totient is φ = 65401455285664.

The previous prime is 65401521612587. The next prime is 65401521612683. The reversal of 65401521612631 is 13621612510456.

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 65401521612631 - 2¹¹ = 65401521610583 is a prime.

It is a super-2 number, since 2×65401521612631² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65401521612131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31661746 + ... + 33664063.

It is an arithmetic number, because the mean of its divisors is an integer number (16350396984900).

Almost surely, 2^{65401521612631} is an apocalyptic number.

65401521612631 is a deficient number, since it is larger than the sum of its proper divisors (66326969).

65401521612631 is a wasteful number, since it uses less digits than its factorization.

65401521612631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66326968.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 65401521612631 in words is "sixty-five trillion, four hundred one billion, five hundred twenty-one million, six hundred twelve thousand, six hundred thirty-one".