44400645251399 has 32 divisors (see below), whose sum is σ = 49565854077696. Its totient is φ = 39588127211520.

The previous prime is 44400645251371. The next prime is 44400645251401. The reversal of 44400645251399 is 99315254600444.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 44400645251399 - 2⁸ = 44400645251143 is a prime.

It is a super-2 number, since 2×44400645251399² (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 (44400645251329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1814729 + ... + 9596589.

It is an arithmetic number, because the mean of its divisors is an integer number (1548932939928).

Almost surely, 2^{44400645251399} is an apocalyptic number.

44400645251399 is a deficient number, since it is larger than the sum of its proper divisors (5165208826297).

44400645251399 is a wasteful number, since it uses less digits than its factorization.

44400645251399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7782155.

The product of its (nonzero) digits is 18662400, while the sum is 56.

The spelling of 44400645251399 in words is "forty-four trillion, four hundred billion, six hundred forty-five million, two hundred fifty-one thousand, three hundred ninety-nine".