15641640515 has 4 divisors (see below), whose sum is σ = 18769968624. Its totient is φ = 12513312408.

The previous prime is 15641640479. The next prime is 15641640523. The reversal of 15641640515 is 51504614651.

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

It is a cyclic number.

It is not a de Polignac number, because 15641640515 - 2¹² = 15641636419 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1564164047 + ... + 1564164056.

It is an arithmetic number, because the mean of its divisors is an integer number (4692492156).

Almost surely, 2^15641640515 is an apocalyptic number.

15641640515 is a deficient number, since it is larger than the sum of its proper divisors (3128328109).

15641640515 is an equidigital number, since it uses as much as digits as its factorization.

15641640515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128328108.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 15641640515 in words is "fifteen billion, six hundred forty-one million, six hundred forty thousand, five hundred fifteen".