65381351372421 has 16 divisors (see below), whose sum is σ = 99877176601728. Its totient is φ = 37267603200000.

The previous prime is 65381351372399. The next prime is 65381351372443. The reversal of 65381351372421 is 12427315318356.

It is an interprime number because it is at equal distance from previous prime (65381351372399) and next prime (65381351372443).

It is not a de Polignac number, because 65381351372421 - 2²¹ = 65381349275269 is a prime.

It is a super-2 number, since 2×65381351372421² (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 (65381351374421) 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, 3882033580 + ... + 3882050421.

It is an arithmetic number, because the mean of its divisors is an integer number (6242323537608).

Almost surely, 2^{65381351372421} is an apocalyptic number.

It is an amenable number.

65381351372421 is a deficient number, since it is larger than the sum of its proper divisors (34495825229307).

65381351372421 is a wasteful number, since it uses less digits than its factorization.

65381351372421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7764084412.

The product of its digits is 3628800, while the sum is 51.

The spelling of 65381351372421 in words is "sixty-five trillion, three hundred eighty-one billion, three hundred fifty-one million, three hundred seventy-two thousand, four hundred twenty-one".