551491839696 has 240 divisors, whose sum is σ = 1690833309504. Its totient is φ = 154404569088.

The previous prime is 551491839641. The next prime is 551491839749. The reversal of 551491839696 is 696938194155.

It is a super-2 number, since 2×551491839696² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 30404646 + ... + 30422778.

Almost surely, 2^551491839696 is an apocalyptic number.

551491839696 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551491839696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845416654752).

551491839696 is an abundant number, since it is smaller than the sum of its proper divisors (1139341469808).

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

551491839696 is a wasteful number, since it uses less digits than its factorization.

551491839696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18418 (or 18405 counting only the distinct ones).

The product of its digits is 62985600, while the sum is 66.

The spelling of 551491839696 in words is "five hundred fifty-one billion, four hundred ninety-one million, eight hundred thirty-nine thousand, six hundred ninety-six".