12721607440965 has 12 divisors (see below), whose sum is σ = 22050786231084. Its totient is φ = 6784857301824.

The previous prime is 12721607440933. The next prime is 12721607440979. The reversal of 12721607440965 is 56904470612721.

12721607440965 is a `hidden beast` number, since 1 + 2 + 7 + 2 + 160 + 74 + 409 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7411891905441 + 5309715535524 = 2722479^2 + 2304282^2 .

It is not a de Polignac number, because 12721607440965 - 2⁵ = 12721607440933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141351193744 + ... + 141351193833.

It is an arithmetic number, because the mean of its divisors is an integer number (1837565519257).

Almost surely, 2^{12721607440965} is an apocalyptic number.

12721607440965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12721607440965 is a deficient number, since it is larger than the sum of its proper divisors (9329178790119).

12721607440965 is a wasteful number, since it uses less digits than its factorization.

12721607440965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282702387588 (or 282702387585 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 12721607440965 in words is "twelve trillion, seven hundred twenty-one billion, six hundred seven million, four hundred forty thousand, nine hundred sixty-five".