1655011615990 has 64 divisors (see below), whose sum is σ = 3178129348800. Its totient is φ = 618354892800.

The previous prime is 1655011615979. The next prime is 1655011615993. The reversal of 1655011615990 is 995161105561.

It is a happy number.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655011615993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30394129 + ... + 30448531.

It is an arithmetic number, because the mean of its divisors is an integer number (49658271075).

Almost surely, 2^{1655011615990} is an apocalyptic number.

1655011615990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1655011615990 is a deficient number, since it is larger than the sum of its proper divisors (1523117732810).

1655011615990 is a wasteful number, since it uses less digits than its factorization.

1655011615990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55777.

The product of its (nonzero) digits is 364500, while the sum is 49.

The spelling of 1655011615990 in words is "one trillion, six hundred fifty-five billion, eleven million, six hundred fifteen thousand, nine hundred ninety".