641264402155 has 8 divisors (see below), whose sum is σ = 828710919792. Its totient is φ = 473549096928.

The previous prime is 641264402143. The next prime is 641264402161. The reversal of 641264402155 is 551204462146.

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

It is a cyclic number.

It is not a de Polignac number, because 641264402155 - 2⁷ = 641264402027 is a prime.

It is a super-2 number, since 2×641264402155² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4932803029 + ... + 4932803158.

It is an arithmetic number, because the mean of its divisors is an integer number (103588864974).

Almost surely, 2^641264402155 is an apocalyptic number.

641264402155 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

641264402155 is a deficient number, since it is larger than the sum of its proper divisors (187446517637).

641264402155 is a wasteful number, since it uses less digits than its factorization.

641264402155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9865606205.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 641264402155 in words is "six hundred forty-one billion, two hundred sixty-four million, four hundred two thousand, one hundred fifty-five".