15921068450 has 24 divisors (see below), whose sum is σ = 33843643392. Its totient is φ = 5458651920.

The previous prime is 15921068447. The next prime is 15921068453. The reversal of 15921068450 is 5486012951.

It is an interprime number because it is at equal distance from previous prime (15921068447) and next prime (15921068453).

It is a junction number, because it is equal to n+sod(n) for n = 15921068398 and 15921068407.

It is not an unprimeable number, because it can be changed into a prime (15921068453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22744034 + ... + 22744733.

It is an arithmetic number, because the mean of its divisors is an integer number (1410151808).

Almost surely, 2^15921068450 is an apocalyptic number.

15921068450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15921068450 is an abundant number, since it is smaller than the sum of its proper divisors (17922574942).

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

15921068450 is a wasteful number, since it uses less digits than its factorization.

15921068450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45488786 (or 45488781 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 15921068450 in words is "fifteen billion, nine hundred twenty-one million, sixty-eight thousand, four hundred fifty".