642651104645 has 64 divisors (see below), whose sum is σ = 873719930880. Its totient is φ = 449556307200.

The previous prime is 642651104633. The next prime is 642651104657. The reversal of 642651104645 is 546401156246.

642651104645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (642651104633) and next prime (642651104657).

It is not a de Polignac number, because 642651104645 - 2⁴ = 642651104629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642651104596 and 642651104605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 332462099 + ... + 332464031.

It is an arithmetic number, because the mean of its divisors is an integer number (13651873920).

Almost surely, 2^642651104645 is an apocalyptic number.

It is an amenable number.

642651104645 is a deficient number, since it is larger than the sum of its proper divisors (231068826235).

642651104645 is a wasteful number, since it uses less digits than its factorization.

642651104645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 642651104645 in words is "six hundred forty-two billion, six hundred fifty-one million, one hundred four thousand, six hundred forty-five".