1550199306564 has 120 divisors (see below), whose sum is σ = 4201214105088. Its totient is φ = 497917342080.

The previous prime is 1550199306521. The next prime is 1550199306571. The reversal of 1550199306564 is 4656039910551.

1550199306564 is a `hidden beast` number, since 1 + 550 + 1 + 9 + 9 + 30 + 6 + 56 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1550199306564.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2009049 + ... + 2671455.

Almost surely, 2^{1550199306564} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1550199306564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2100607052544).

1550199306564 is an abundant number, since it is smaller than the sum of its proper divisors (2651014798524).

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

1550199306564 is a wasteful number, since it uses less digits than its factorization.

1550199306564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662687 (or 662676 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 54.

The spelling of 1550199306564 in words is "one trillion, five hundred fifty billion, one hundred ninety-nine million, three hundred six thousand, five hundred sixty-four".