15554045551 has 24 divisors (see below), whose sum is σ = 17296650000. Its totient is φ = 13975104000.

The previous prime is 15554045539. The next prime is 15554045561.

15554045551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 15554045551 - 2⁵ = 15554045519 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 (15554045561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12452575 + ... + 12453823.

It is an arithmetic number, because the mean of its divisors is an integer number (720693750).

Almost surely, 2^15554045551 is an apocalyptic number.

15554045551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15554045551 is a deficient number, since it is larger than the sum of its proper divisors (1742604449).

15554045551 is a wasteful number, since it uses less digits than its factorization.

15554045551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391 (or 2380 counting only the distinct ones).

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

The spelling of 15554045551 in words is "fifteen billion, five hundred fifty-four million, forty-five thousand, five hundred fifty-one".