15921418650 has 96 divisors (see below), whose sum is σ = 41707235328. Its totient is φ = 4013150400.

The previous prime is 15921418637. The next prime is 15921418651. The reversal of 15921418650 is 5681412951.

It is not an unprimeable number, because it can be changed into a prime (15921418651) 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, 160137 + ... + 239763.

It is an arithmetic number, because the mean of its divisors is an integer number (434450368).

Almost surely, 2^15921418650 is an apocalyptic number.

15921418650 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 15921418650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20853617664).

15921418650 is an abundant number, since it is smaller than the sum of its proper divisors (25785816678).

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

15921418650 is a wasteful number, since it uses less digits than its factorization.

15921418650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79716 (or 79711 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The spelling of 15921418650 in words is "fifteen billion, nine hundred twenty-one million, four hundred eighteen thousand, six hundred fifty".