1644465331431 has 48 divisors (see below), whose sum is σ = 2628129014784. Its totient is φ = 984515833152.

The previous prime is 1644465331391. The next prime is 1644465331441. The reversal of 1644465331431 is 1341335644461.

1644465331431 is a `hidden beast` number, since 1 + 6 + 44 + 46 + 533 + 1 + 4 + 31 = 666.

It is not a de Polignac number, because 1644465331431 - 2⁶ = 1644465331367 is a prime.

It is a super-2 number, since 2×1644465331431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644465331441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22980 + ... + 1813686.

It is an arithmetic number, because the mean of its divisors is an integer number (54752687808).

Almost surely, 2^{1644465331431} is an apocalyptic number.

1644465331431 is a deficient number, since it is larger than the sum of its proper divisors (983663683353).

1644465331431 is a wasteful number, since it uses less digits than its factorization.

1644465331431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790940 (or 1790937 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The spelling of 1644465331431 in words is "one trillion, six hundred forty-four billion, four hundred sixty-five million, three hundred thirty-one thousand, four hundred thirty-one".