15616421406601 has 4 divisors (see below), whose sum is σ = 15622898564304. Its totient is φ = 15609944248900.

The previous prime is 15616421406569. The next prime is 15616421406709. The reversal of 15616421406601 is 10660412461651.

15616421406601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15616421406601 - 2⁵ = 15616421406569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15616421401601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3238575235 + ... + 3238580056.

It is an arithmetic number, because the mean of its divisors is an integer number (3905724641076).

Almost surely, 2^{15616421406601} is an apocalyptic number.

It is an amenable number.

15616421406601 is a deficient number, since it is larger than the sum of its proper divisors (6477157703).

15616421406601 is an equidigital number, since it uses as much as digits as its factorization.

15616421406601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6477157702.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 15616421406601 in words is "fifteen trillion, six hundred sixteen billion, four hundred twenty-one million, four hundred six thousand, six hundred one".