15616601005501 has 4 divisors (see below), whose sum is σ = 15616823607292. Its totient is φ = 15616378403712.

The previous prime is 15616601005487. The next prime is 15616601005507. The reversal of 15616601005501 is 10550010661651.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2115936799876 + 13500664205625 = 1454626^2 + 3674325^2 .

It is a cyclic number.

It is not a de Polignac number, because 15616601005501 - 2⁹ = 15616601004989 is a prime.

It is a super-2 number, since 2×15616601005501² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15616601005507) 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, 111195630 + ... + 111335983.

It is an arithmetic number, because the mean of its divisors is an integer number (3904205901823).

Almost surely, 2^{15616601005501} is an apocalyptic number.

It is an amenable number.

15616601005501 is a deficient number, since it is larger than the sum of its proper divisors (222601791).

15616601005501 is an equidigital number, since it uses as much as digits as its factorization.

15616601005501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222601790.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 15616601005501 in words is "fifteen trillion, six hundred sixteen billion, six hundred one million, five thousand, five hundred one".