646745560425451 has 16 divisors (see below), whose sum is σ = 653305019421600. Its totient is φ = 640189176307200.

The previous prime is 646745560425409. The next prime is 646745560425479. The reversal of 646745560425451 is 154524065547646.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 646745560425451 - 2¹⁵ = 646745560392683 is a prime.

It is a super-2 number, since 2×646745560425451² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646745560425401) 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, 13803693741 + ... + 13803740593.

It is an arithmetic number, because the mean of its divisors is an integer number (40831563713850).

Almost surely, 2^{646745560425451} is an apocalyptic number.

646745560425451 is a deficient number, since it is larger than the sum of its proper divisors (6559458996149).

646745560425451 is a wasteful number, since it uses less digits than its factorization.

646745560425451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76686.

The product of its (nonzero) digits is 483840000, while the sum is 64.

The spelling of 646745560425451 in words is "six hundred forty-six trillion, seven hundred forty-five billion, five hundred sixty million, four hundred twenty-five thousand, four hundred fifty-one".