551436556440 has 128 divisors (see below), whose sum is σ = 2062515985920. Its totient is φ = 114584217600.

The previous prime is 551436556423. The next prime is 551436556487. The reversal of 551436556440 is 44655634155.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 551436556440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29830401 + ... + 29848880.

It is an arithmetic number, because the mean of its divisors is an integer number (16113406140).

Almost surely, 2^551436556440 is an apocalyptic number.

It is an amenable number.

551436556440 is an abundant number, since it is smaller than the sum of its proper divisors (1511079429480).

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

551436556440 is a wasteful number, since it uses less digits than its factorization.

551436556440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59679313 (or 59679309 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 48.

The spelling of 551436556440 in words is "five hundred fifty-one billion, four hundred thirty-six million, five hundred fifty-six thousand, four hundred forty".