645646474232 has 8 divisors (see below), whose sum is σ = 1210587139200. Its totient is φ = 322823237112.

The previous prime is 645646474217. The next prime is 645646474261. The reversal of 645646474232 is 232474646546.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40352904632 + ... + 40352904647.

It is an arithmetic number, because the mean of its divisors is an integer number (151323392400).

Almost surely, 2^645646474232 is an apocalyptic number.

It is an amenable number.

645646474232 is a deficient number, since it is larger than the sum of its proper divisors (564940664968).

645646474232 is a wasteful number, since it uses less digits than its factorization.

645646474232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80705809285 (or 80705809281 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 53.

The spelling of 645646474232 in words is "six hundred forty-five billion, six hundred forty-six million, four hundred seventy-four thousand, two hundred thirty-two".