641756495 has 4 divisors (see below), whose sum is σ = 770107800. Its totient is φ = 513405192.

The previous prime is 641756473. The next prime is 641756501. The reversal of 641756495 is 594657146.

641756495 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641756495 - 2⁶ = 641756431 is a prime.

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, 64175645 + ... + 64175654.

It is an arithmetic number, because the mean of its divisors is an integer number (192526950).

Almost surely, 2^641756495 is an apocalyptic number.

641756495 is a deficient number, since it is larger than the sum of its proper divisors (128351305).

641756495 is a wasteful number, since it uses less digits than its factorization.

641756495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128351304.

The product of its digits is 907200, while the sum is 47.

The square root of 641756495 is about 25332.9132750262. The cubic root of 641756495 is about 862.5615420625.

The spelling of 641756495 in words is "six hundred forty-one million, seven hundred fifty-six thousand, four hundred ninety-five".