551661264 has 180 divisors, whose sum is σ = 1939855008. Its totient is φ = 143256960.

The previous prime is 551661263. The next prime is 551661277. The reversal of 551661264 is 462166155.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551661263) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 119707 + ... + 124229.

Almost surely, 2^551661264 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 551661264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969927504).

551661264 is an abundant number, since it is smaller than the sum of its proper divisors (1388193744).

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

551661264 is a wasteful number, since it uses less digits than its factorization.

551661264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4566 (or 4546 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 551661264 is about 23487.4703618759. The cubic root of 551661264 is about 820.1453559494.

The spelling of 551661264 in words is "five hundred fifty-one million, six hundred sixty-one thousand, two hundred sixty-four".