15554786660 has 96 divisors (see below), whose sum is σ = 37716295680. Its totient is φ = 5278347648.

The previous prime is 15554786651. The next prime is 15554786707. The reversal of 15554786660 is 6668745551.

It is a happy number.

It is a super-2 number, since 2×15554786660² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7452137 + ... + 7454223.

It is an arithmetic number, because the mean of its divisors is an integer number (392878080).

Almost surely, 2^15554786660 is an apocalyptic number.

15554786660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15554786660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18858147840).

15554786660 is an abundant number, since it is smaller than the sum of its proper divisors (22161509020).

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

15554786660 is a wasteful number, since it uses less digits than its factorization.

15554786660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625 (or 2623 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 53.

The spelling of 15554786660 in words is "fifteen billion, five hundred fifty-four million, seven hundred eighty-six thousand, six hundred sixty".