15605661610 has 72 divisors (see below), whose sum is σ = 35917110180. Its totient is φ = 4864083840.

The previous prime is 15605661587. The next prime is 15605661619. The reversal of 15605661610 is 1616650651.

It can be written as a sum of positive squares in 2 ways, for example, as 14745002041 + 860659569 = 121429^2 + 29337^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15605661610.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15605661619) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 72315 + ... + 190894.

Almost surely, 2^15605661610 is an apocalyptic number.

15605661610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15605661610 is an abundant number, since it is smaller than the sum of its proper divisors (20311448570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15605661610 is a wasteful number, since it uses less digits than its factorization.

15605661610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263252 (or 263234 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 15605661610 in words is "fifteen billion, six hundred five million, six hundred sixty-one thousand, six hundred ten".