15761661255 has 48 divisors (see below), whose sum is σ = 27858841920. Its totient is φ = 8240753664.

The previous prime is 15761661217. The next prime is 15761661257. The reversal of 15761661255 is 55216616751.

It is a happy number.

15761661255 is a `hidden beast` number, since 1 + 5 + 7 + 616 + 6 + 1 + 25 + 5 = 666.

It is not a de Polignac number, because 15761661255 - 2⁹ = 15761660743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 15761661255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15761661257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4236286 + ... + 4240004.

It is an arithmetic number, because the mean of its divisors is an integer number (580392540).

Almost surely, 2^15761661255 is an apocalyptic number.

15761661255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15761661255 is a deficient number, since it is larger than the sum of its proper divisors (12097180665).

15761661255 is a wasteful number, since it uses less digits than its factorization.

15761661255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560 (or 5557 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The spelling of 15761661255 in words is "fifteen billion, seven hundred sixty-one million, six hundred sixty-one thousand, two hundred fifty-five".