15645240665 has 8 divisors (see below), whose sum is σ = 19590562368. Its totient is φ = 11972010160.

The previous prime is 15645240629. The next prime is 15645240671. The reversal of 15645240665 is 56604254651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15645240665 - 2¹⁴ = 15645224281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68022671 + ... + 68022900.

It is an arithmetic number, because the mean of its divisors is an integer number (2448820296).

Almost surely, 2^15645240665 is an apocalyptic number.

It is an amenable number.

15645240665 is a deficient number, since it is larger than the sum of its proper divisors (3945321703).

15645240665 is a wasteful number, since it uses less digits than its factorization.

15645240665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136045599.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 15645240665 in words is "fifteen billion, six hundred forty-five million, two hundred forty thousand, six hundred sixty-five".