15661154080 has 192 divisors, whose sum is σ = 43589145600. Its totient is φ = 5242245120.

The previous prime is 15661154077. The next prime is 15661154081. The reversal of 15661154080 is 8045116651.

It is not an unprimeable number, because it can be changed into a prime (15661154081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10958806 + ... + 10960234.

It is an arithmetic number, because the mean of its divisors is an integer number (227026800).

Almost surely, 2^15661154080 is an apocalyptic number.

15661154080 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 15661154080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21794572800).

15661154080 is an abundant number, since it is smaller than the sum of its proper divisors (27927991520).

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

15661154080 is a wasteful number, since it uses less digits than its factorization.

15661154080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947 (or 1939 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 15661154080 in words is "fifteen billion, six hundred sixty-one million, one hundred fifty-four thousand, eighty".