641275778901 has 16 divisors (see below), whose sum is σ = 879499653120. Its totient is φ = 415388653680.

The previous prime is 641275778893. The next prime is 641275778951. The reversal of 641275778901 is 109877572146.

It is not a de Polignac number, because 641275778901 - 2³ = 641275778893 is a prime.

It is a super-2 number, since 2×641275778901² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641275778951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12988791 + ... + 13038068.

It is an arithmetic number, because the mean of its divisors is an integer number (54968728320).

Almost surely, 2^641275778901 is an apocalyptic number.

It is an amenable number.

641275778901 is a deficient number, since it is larger than the sum of its proper divisors (238223874219).

641275778901 is a wasteful number, since it uses less digits than its factorization.

641275778901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26027096.

The product of its (nonzero) digits is 5927040, while the sum is 57.

The spelling of 641275778901 in words is "six hundred forty-one billion, two hundred seventy-five million, seven hundred seventy-eight thousand, nine hundred one".