646642045 has 16 divisors (see below), whose sum is σ = 890208000. Its totient is φ = 441719424.

The previous prime is 646642021. The next prime is 646642093. The reversal of 646642045 is 540246646.

It is a cyclic number.

It is not a de Polignac number, because 646642045 - 2⁹ = 646641533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646641995 and 646642013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25920 + ... + 44329.

It is an arithmetic number, because the mean of its divisors is an integer number (55638000).

Almost surely, 2^646642045 is an apocalyptic number.

It is an amenable number.

646642045 is a deficient number, since it is larger than the sum of its proper divisors (243565955).

646642045 is a wasteful number, since it uses less digits than its factorization.

646642045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70524.

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 646642045 is about 25429.1573788830. The cubic root of 646642045 is about 864.7448410422.

The spelling of 646642045 in words is "six hundred forty-six million, six hundred forty-two thousand, forty-five".