1555400045551 has 48 divisors (see below), whose sum is σ = 1828563093504. Its totient is φ = 1319127480000.

The previous prime is 1555400045539. The next prime is 1555400045579.

1555400045551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1555400045551 - 2⁵ = 1555400045519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555400043551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18791266 + ... + 18873856.

It is an arithmetic number, because the mean of its divisors is an integer number (38095064448).

Almost surely, 2^{1555400045551} is an apocalyptic number.

1555400045551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1555400045551 is a deficient number, since it is larger than the sum of its proper divisors (273163047953).

1555400045551 is a wasteful number, since it uses less digits than its factorization.

1555400045551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82804 (or 82793 counting only the distinct ones).

The product of its (nonzero) digits is 250000, while the sum is 40.

It can be divided in two parts, 15554000 and 45551, that added together give a palindrome (15599551).

The spelling of 1555400045551 in words is "one trillion, five hundred fifty-five billion, four hundred million, forty-five thousand, five hundred fifty-one".