641266515 has 48 divisors (see below), whose sum is σ = 1134308448. Its totient is φ = 335075328.

The previous prime is 641266501. The next prime is 641266517. The reversal of 641266515 is 515662146.

641266515 is a `hidden beast` number, since 641 + 2 + 6 + 6 + 5 + 1 + 5 = 666.

It is not a de Polignac number, because 641266515 - 2⁷ = 641266387 is a prime.

It is a super-2 number, since 2×641266515² = 822445486520490450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641266515.

It is not an unprimeable number, because it can be changed into a prime (641266517) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 466369 + ... + 467741.

It is an arithmetic number, because the mean of its divisors is an integer number (23631426).

Almost surely, 2^641266515 is an apocalyptic number.

641266515 is a deficient number, since it is larger than the sum of its proper divisors (493041933).

641266515 is a wasteful number, since it uses less digits than its factorization.

641266515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588 (or 1585 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 641266515 is about 25323.2406101589. The cubic root of 641266515 is about 862.3419647439.

It can be divided in two parts, 6412 and 66515, that added together give a palindrome (72927).

The spelling of 641266515 in words is "six hundred forty-one million, two hundred sixty-six thousand, five hundred fifteen".