1555199999872 has 32 divisors (see below), whose sum is σ = 3156707560680. Its totient is φ = 762928298496.

The previous prime is 1555199999809. The next prime is 1555199999939. The reversal of 1555199999872 is 2789999915551.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 1555199999792 and 1555199999801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114615858 + ... + 114629425.

Almost surely, 2^{1555199999872} is an apocalyptic number.

It is an amenable number.

1555199999872 is an abundant number, since it is smaller than the sum of its proper divisors (1601507560808).

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

1555199999872 is an equidigital number, since it uses as much as digits as its factorization.

1555199999872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229245350 (or 229245338 counting only the distinct ones).

The product of its digits is 826686000, while the sum is 79.

The spelling of 1555199999872 in words is "one trillion, five hundred fifty-five billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred seventy-two".