641056023624655 has 4 divisors (see below), whose sum is σ = 769267228349592. Its totient is φ = 512844818899720.

The previous prime is 641056023624589. The next prime is 641056023624659. The reversal of 641056023624655 is 556426320650146.

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

It is not a de Polignac number, because 641056023624655 - 2⁹ = 641056023624143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641056023624596 and 641056023624605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641056023624659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64105602362461 + ... + 64105602362470.

It is an arithmetic number, because the mean of its divisors is an integer number (192316807087398).

Almost surely, 2^{641056023624655} is an apocalyptic number.

641056023624655 is a deficient number, since it is larger than the sum of its proper divisors (128211204724937).

641056023624655 is a wasteful number, since it uses less digits than its factorization.

641056023624655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128211204724936.

The product of its (nonzero) digits is 31104000, while the sum is 55.

The spelling of 641056023624655 in words is "six hundred forty-one trillion, fifty-six billion, twenty-three million, six hundred twenty-four thousand, six hundred fifty-five".