15541799616 has 336 divisors, whose sum is σ = 53507213280. Its totient is φ = 4410685440.

The previous prime is 15541799599. The next prime is 15541799617. The reversal of 15541799616 is 61699714551.

15541799616 is a `hidden beast` number, since 1 + 5 + 5 + 4 + 17 + 9 + 9 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (15541799617) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14647726 + ... + 14648786.

Almost surely, 2^15541799616 is an apocalyptic number.

15541799616 is a gapful number since it is divisible by the number (16) 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 15541799616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26753606640).

15541799616 is an abundant number, since it is smaller than the sum of its proper divisors (37965413664).

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

15541799616 is a wasteful number, since it uses less digits than its factorization.

15541799616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1246 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The spelling of 15541799616 in words is "fifteen billion, five hundred forty-one million, seven hundred ninety-nine thousand, six hundred sixteen".