15639064797561 has 8 divisors (see below), whose sum is σ = 20855047107360. Its totient is φ = 10424562843072.

The previous prime is 15639064797539. The next prime is 15639064797569. The reversal of 15639064797561 is 16579746093651.

15639064797561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 15639064797561 - 2⁹ = 15639064797049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15639064797569) 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, 370064176 + ... + 370106433.

It is an arithmetic number, because the mean of its divisors is an integer number (2606880888420).

Almost surely, 2^{15639064797561} is an apocalyptic number.

It is an amenable number.

15639064797561 is a deficient number, since it is larger than the sum of its proper divisors (5215982309799).

15639064797561 is an equidigital number, since it uses as much as digits as its factorization.

15639064797561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740177655.

The product of its (nonzero) digits is 257191200, while the sum is 69.

The spelling of 15639064797561 in words is "fifteen trillion, six hundred thirty-nine billion, sixty-four million, seven hundred ninety-seven thousand, five hundred sixty-one".