12621744161765 has 8 divisors (see below), whose sum is σ = 15146742595608. Its totient is φ = 10096962261760.

The previous prime is 12621744161753. The next prime is 12621744161797. The reversal of 12621744161765 is 56716144712621.

It can be written as a sum of positive squares in 4 ways, for example, as 4037394992929 + 8584349168836 = 2009327^2 + 2929906^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12621744161765 - 2⁴ = 12621744161749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54005192 + ... + 54238401.

It is an arithmetic number, because the mean of its divisors is an integer number (1893342824451).

Almost surely, 2^{12621744161765} is an apocalyptic number.

It is an amenable number.

12621744161765 is a deficient number, since it is larger than the sum of its proper divisors (2524998433843).

12621744161765 is a wasteful number, since it uses less digits than its factorization.

12621744161765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108266919.

The product of its digits is 3386880, while the sum is 53.

The spelling of 12621744161765 in words is "twelve trillion, six hundred twenty-one billion, seven hundred forty-four million, one hundred sixty-one thousand, seven hundred sixty-five".