15545581261 has 8 divisors (see below), whose sum is σ = 17787816320. Its totient is φ = 13308705648.

The previous prime is 15545581213. The next prime is 15545581277. The reversal of 15545581261 is 16218554551.

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

It is not a de Polignac number, because 15545581261 - 2¹⁷ = 15545450189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15545581061) 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, 1333641 + ... + 1345246.

It is an arithmetic number, because the mean of its divisors is an integer number (2223477040).

Almost surely, 2^15545581261 is an apocalyptic number.

It is an amenable number.

15545581261 is a deficient number, since it is larger than the sum of its proper divisors (2242235059).

15545581261 is an equidigital number, since it uses as much as digits as its factorization.

15545581261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679723.

The product of its digits is 240000, while the sum is 43.

The spelling of 15545581261 in words is "fifteen billion, five hundred forty-five million, five hundred eighty-one thousand, two hundred sixty-one".