15421656642 has 16 divisors (see below), whose sum is σ = 35249500992. Its totient is φ = 4406187600.

The previous prime is 15421656631. The next prime is 15421656659. The reversal of 15421656642 is 24665612451.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 367182301 = 15421656642 / (1 + 5 + 4 + 2 + 1 + 6 + 5 + 6 + 6 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 15421656594 and 15421656603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183591109 + ... + 183591192.

It is an arithmetic number, because the mean of its divisors is an integer number (2203093812).

Almost surely, 2^15421656642 is an apocalyptic number.

15421656642 is an abundant number, since it is smaller than the sum of its proper divisors (19827844350).

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

15421656642 is a wasteful number, since it uses less digits than its factorization.

15421656642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367182313.

The product of its digits is 345600, while the sum is 42.

The spelling of 15421656642 in words is "fifteen billion, four hundred twenty-one million, six hundred fifty-six thousand, six hundred forty-two".