643105135515 has 16 divisors (see below), whose sum is σ = 1029759153696. Its totient is φ = 342725760000.

The previous prime is 643105135487. The next prime is 643105135531. The reversal of 643105135515 is 515531501346.

It is not a de Polignac number, because 643105135515 - 2⁶ = 643105135451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16457686 + ... + 16496715.

It is an arithmetic number, because the mean of its divisors is an integer number (64359947106).

Almost surely, 2^643105135515 is an apocalyptic number.

643105135515 is a deficient number, since it is larger than the sum of its proper divisors (386654018181).

643105135515 is a wasteful number, since it uses less digits than its factorization.

643105135515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32955710.

The product of its (nonzero) digits is 135000, while the sum is 39.

The spelling of 643105135515 in words is "six hundred forty-three billion, one hundred five million, one hundred thirty-five thousand, five hundred fifteen".