1550440857889 has 81 divisors (see below), whose sum is σ = 2014706781171. Its totient is φ = 1188785838240.

The previous prime is 1550440857827. The next prime is 1550440857899. The reversal of 1550440857889 is 9887580440551.

The square root of 1550440857889 is 1245167.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 454457998225 + 1095982859664 = 674135^2 + 1046892^2 .

It is not a de Polignac number, because 1550440857889 - 2¹¹ = 1550440855841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1550440857889.

It is not an unprimeable number, because it can be changed into a prime (1550440857899) by changing a digit.

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 80 ways as a sum of consecutive naturals, for example, 9875419399 + ... + 9875419555.

Almost surely, 2^{1550440857889} is an apocalyptic number.

1550440857889 is the 1245167-th square number.

1550440857889 is the 622584-th centered octagonal number.

It is an amenable number.

1550440857889 is a deficient number, since it is larger than the sum of its proper divisors (464265923282).

1550440857889 is an equidigital number, since it uses as much as digits as its factorization.

1550440857889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 64512000, while the sum is 64.

Multiplying 1550440857889 by its sum of digits (64), we get a square (99228214904896 = 9961336²).

The spelling of 1550440857889 in words is "one trillion, five hundred fifty billion, four hundred forty million, eight hundred fifty-seven thousand, eight hundred eighty-nine".