645205844152 has 8 divisors (see below), whose sum is σ = 1209760957800. Its totient is φ = 322602922072.

The previous prime is 645205844141. The next prime is 645205844189. The reversal of 645205844152 is 251448502546.

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

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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, 40325365252 + ... + 40325365267.

It is an arithmetic number, because the mean of its divisors is an integer number (151220119725).

Almost surely, 2^645205844152 is an apocalyptic number.

It is an amenable number.

645205844152 is a deficient number, since it is larger than the sum of its proper divisors (564555113648).

645205844152 is a wasteful number, since it uses less digits than its factorization.

645205844152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80650730525 (or 80650730521 counting only the distinct ones).

The product of its (nonzero) digits is 1536000, while the sum is 46.

It can be divided in two parts, 6452058 and 44152, that added together give a triangular number (6496210 = T₃₆₀₄).

The spelling of 645205844152 in words is "six hundred forty-five billion, two hundred five million, eight hundred forty-four thousand, one hundred fifty-two".