645577235654 has 8 divisors (see below), whose sum is σ = 1042855534560. Its totient is φ = 297958724136.

The previous prime is 645577235621. The next prime is 645577235669. The reversal of 645577235654 is 456532775546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 645577235593 and 645577235602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12414946814 + ... + 12414946865.

It is an arithmetic number, because the mean of its divisors is an integer number (130356941820).

Almost surely, 2^645577235654 is an apocalyptic number.

645577235654 is a deficient number, since it is larger than the sum of its proper divisors (397278298906).

645577235654 is a wasteful number, since it uses less digits than its factorization.

645577235654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24829893694.

The product of its digits is 105840000, while the sum is 59.

The spelling of 645577235654 in words is "six hundred forty-five billion, five hundred seventy-seven million, two hundred thirty-five thousand, six hundred fifty-four".