15660156551601 has 8 divisors (see below), whose sum is σ = 21274174938240. Its totient is φ = 10243121266352.

The previous prime is 15660156551521. The next prime is 15660156551623. The reversal of 15660156551601 is 10615565106651.

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

It is a cyclic number.

It is not a de Polignac number, because 15660156551601 - 2¹¹ = 15660156549553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15660156559601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49245775161 + ... + 49245775478.

It is an arithmetic number, because the mean of its divisors is an integer number (2659271867280).

Almost surely, 2^{15660156551601} is an apocalyptic number.

It is an amenable number.

15660156551601 is a deficient number, since it is larger than the sum of its proper divisors (5614018386639).

15660156551601 is an equidigital number, since it uses as much as digits as its factorization.

15660156551601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98491550695.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 15660156551601 in words is "fifteen trillion, six hundred sixty billion, one hundred fifty-six million, five hundred fifty-one thousand, six hundred one".