15621845473 has 8 divisors (see below), whose sum is σ = 16825010048. Its totient is φ = 14418892944.

The previous prime is 15621845413. The next prime is 15621845489. The reversal of 15621845473 is 37454812651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15621845473 - 2²¹ = 15619748321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15621845413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121240 + ... + 214342.

It is an arithmetic number, because the mean of its divisors is an integer number (2103126256).

Almost surely, 2^15621845473 is an apocalyptic number.

15621845473 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

15621845473 is a deficient number, since it is larger than the sum of its proper divisors (1203164575).

15621845473 is a wasteful number, since it uses less digits than its factorization.

15621845473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106023.

The product of its digits is 806400, while the sum is 46.

The spelling of 15621845473 in words is "fifteen billion, six hundred twenty-one million, eight hundred forty-five thousand, four hundred seventy-three".