551601616 has 40 divisors (see below), whose sum is σ = 1129615200. Its totient is φ = 260208000.

The previous prime is 551601613. The next prime is 551601667. The reversal of 551601616 is 616106155.

It is a super-2 number, since 2×551601616² = 608528685547622912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551601613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72690 + ... + 79918.

It is an arithmetic number, because the mean of its divisors is an integer number (28240380).

Almost surely, 2^551601616 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 551601616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (564807600).

551601616 is an abundant number, since it is smaller than the sum of its proper divisors (578013584).

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

551601616 is a wasteful number, since it uses less digits than its factorization.

551601616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507 (or 7501 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 551601616 is about 23486.2005441493. The cubic root of 551601616 is about 820.1157956639.

The spelling of 551601616 in words is "five hundred fifty-one million, six hundred one thousand, six hundred sixteen".