15501620642 has 16 divisors (see below), whose sum is σ = 23437985472. Its totient is φ = 7688999760.

The previous prime is 15501620633. The next prime is 15501620683. The reversal of 15501620642 is 24602610551.

It is a junction number, because it is equal to n+sod(n) for n = 15501620599 and 15501620608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 913043 + ... + 929865.

It is an arithmetic number, because the mean of its divisors is an integer number (1464874092).

Almost surely, 2^15501620642 is an apocalyptic number.

15501620642 is a deficient number, since it is larger than the sum of its proper divisors (7936364830).

15501620642 is a wasteful number, since it uses less digits than its factorization.

15501620642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20473.

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 15501620642 in words is "fifteen billion, five hundred one million, six hundred twenty thousand, six hundred forty-two".