551531431440 has 240 divisors, whose sum is σ = 2030193112896. Its totient is φ = 133070515200.

The previous prime is 551531431439. The next prime is 551531431457. The reversal of 551531431440 is 44134135155.

551531431440 is a `hidden beast` number, since 5 + 51 + 531 + 4 + 31 + 4 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 551531431395 and 551531431404.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1506102 + ... + 1836138.

Almost surely, 2^551531431440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551531431440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015096556448).

551531431440 is an abundant number, since it is smaller than the sum of its proper divisors (1478661681456).

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

551531431440 is a wasteful number, since it uses less digits than its factorization.

551531431440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330278 (or 330269 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 551531431440 its reverse (44134135155), we get a palindrome (595665566595).

The spelling of 551531431440 in words is "five hundred fifty-one billion, five hundred thirty-one million, four hundred thirty-one thousand, four hundred forty".