645336052140451 has 32 divisors (see below), whose sum is σ = 757432417775616. Its totient is φ = 538310283840000.

The previous prime is 645336052140427. The next prime is 645336052140473. The reversal of 645336052140451 is 154041250633546.

It is a happy number.

It is not a de Polignac number, because 645336052140451 - 2⁹ = 645336052139939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645336052140395 and 645336052140404.

It is not an unprimeable number, because it can be changed into a prime (645336052540451) 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, 957204526 + ... + 957878476.

It is an arithmetic number, because the mean of its divisors is an integer number (23669763055488).

Almost surely, 2^{645336052140451} is an apocalyptic number.

645336052140451 is a deficient number, since it is larger than the sum of its proper divisors (112096365635165).

645336052140451 is a wasteful number, since it uses less digits than its factorization.

645336052140451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685603.

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 645336052140451 in words is "six hundred forty-five trillion, three hundred thirty-six billion, fifty-two million, one hundred forty thousand, four hundred fifty-one".