15660000061650 has 288 divisors, whose sum is σ = 49234371084288. Its totient is φ = 3494746684800.

The previous prime is 15660000061649. The next prime is 15660000061679. The reversal of 15660000061650 is 5616000006651.

15660000061650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 22696047 + ... + 23375853.

It is an arithmetic number, because the mean of its divisors is an integer number (170952677376).

Almost surely, 2^{15660000061650} is an apocalyptic number.

15660000061650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15660000061650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24617185542144).

15660000061650 is an abundant number, since it is smaller than the sum of its proper divisors (33574371022638).

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

15660000061650 is a wasteful number, since it uses less digits than its factorization.

15660000061650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680006 (or 679998 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 15660000061650 in words is "fifteen trillion, six hundred sixty billion, sixty-one thousand, six hundred fifty".