15642020550 has 96 divisors (see below), whose sum is σ = 43592709888. Its totient is φ = 3682926720.

The previous prime is 15642020533. The next prime is 15642020561. The reversal of 15642020550 is 5502024651.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129532 + ... + 219231.

It is an arithmetic number, because the mean of its divisors is an integer number (454090728).

Almost surely, 2^15642020550 is an apocalyptic number.

15642020550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15642020550 is an abundant number, since it is smaller than the sum of its proper divisors (27950689338).

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

15642020550 is a wasteful number, since it uses less digits than its factorization.

15642020550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348814 (or 348809 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 15642020550 in words is "fifteen billion, six hundred forty-two million, twenty thousand, five hundred fifty".