1550220453440 has 56 divisors (see below), whose sum is σ = 3851960840640. Its totient is φ = 593127822848.

The previous prime is 1550220453421. The next prime is 1550220453443. The reversal of 1550220453440 is 443540220551.

It is a self number, because there is not a number n which added to its sum of digits gives 1550220453440.

It is not an unprimeable number, because it can be changed into a prime (1550220453443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105306530 + ... + 105321249.

Almost surely, 2^{1550220453440} is an apocalyptic number.

1550220453440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1550220453440 is an abundant number, since it is smaller than the sum of its proper divisors (2301740387200).

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

1550220453440 is a wasteful number, since it uses less digits than its factorization.

1550220453440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210627819 (or 210627809 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 1550220453440 its reverse (443540220551), we get a palindrome (1993760673991).

The spelling of 1550220453440 in words is "one trillion, five hundred fifty billion, two hundred twenty million, four hundred fifty-three thousand, four hundred forty".