641515807811 has 8 divisors (see below), whose sum is σ = 645085350000. Its totient is φ = 637946543520.

The previous prime is 641515807799. The next prime is 641515807903. The reversal of 641515807811 is 118708515146.

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 641515807811 - 2²² = 641511613507 is a prime.

It is a super-2 number, since 2×641515807811² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641515837811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6056060 + ... + 6161078.

It is an arithmetic number, because the mean of its divisors is an integer number (80635668750).

Almost surely, 2^641515807811 is an apocalyptic number.

641515807811 is a deficient number, since it is larger than the sum of its proper divisors (3569542189).

641515807811 is a wasteful number, since it uses less digits than its factorization.

641515807811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138949.

The product of its (nonzero) digits is 268800, while the sum is 47.

The spelling of 641515807811 in words is "six hundred forty-one billion, five hundred fifteen million, eight hundred seven thousand, eight hundred eleven".