641501545965 has 24 divisors (see below), whose sum is σ = 1193978388960. Its totient is φ = 293257849248.

The previous prime is 641501545939. The next prime is 641501545973. The reversal of 641501545965 is 569545105146.

It is not a de Polignac number, because 641501545965 - 2⁷ = 641501545837 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 436394875 + ... + 436396344.

It is an arithmetic number, because the mean of its divisors is an integer number (49749099540).

Almost surely, 2^641501545965 is an apocalyptic number.

It is an amenable number.

641501545965 is a deficient number, since it is larger than the sum of its proper divisors (552476842995).

641501545965 is a wasteful number, since it uses less digits than its factorization.

641501545965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872791241 (or 872791234 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 51.

It can be divided in two parts, 64150 and 1545965, that added together give a triangular number (1610115 = T₁₇₉₄).

The spelling of 641501545965 in words is "six hundred forty-one billion, five hundred one million, five hundred forty-five thousand, nine hundred sixty-five".