551656306512 has 160 divisors (see below), whose sum is σ = 1682378035200. Its totient is φ = 172578874752.

The previous prime is 551656306403. The next prime is 551656306517. The reversal of 551656306512 is 215603656155.

551656306512 is a `hidden beast` number, since 5 + 5 + 1 + 6 + 5 + 630 + 6 + 5 + 1 + 2 = 666.

It is a super-2 number, since 2×551656306512² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551656306517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 564193 + ... + 1192319.

It is an arithmetic number, because the mean of its divisors is an integer number (10514862720).

Almost surely, 2^551656306512 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 551656306512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (841189017600).

551656306512 is an abundant number, since it is smaller than the sum of its proper divisors (1130721728688).

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

551656306512 is a wasteful number, since it uses less digits than its factorization.

551656306512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628270 (or 628258 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 551656306512 in words is "five hundred fifty-one billion, six hundred fifty-six million, three hundred six thousand, five hundred twelve".