551766642 has 64 divisors (see below), whose sum is σ = 1319583744. Its totient is φ = 150384960.

The previous prime is 551766599. The next prime is 551766647. The reversal of 551766642 is 246667155.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 551766594 and 551766603.

It is not an unprimeable number, because it can be changed into a prime (551766647) 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 31 ways as a sum of consecutive naturals, for example, 585892 + ... + 586832.

It is an arithmetic number, because the mean of its divisors is an integer number (20618496).

Almost surely, 2^551766642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551766642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659791872).

551766642 is an abundant number, since it is smaller than the sum of its proper divisors (767817102).

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

551766642 is a wasteful number, since it uses less digits than its factorization.

551766642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its digits is 302400, while the sum is 42.

The square root of 551766642 is about 23489.7135359289. The cubic root of 551766642 is about 820.1975738475.

The spelling of 551766642 in words is "five hundred fifty-one million, seven hundred sixty-six thousand, six hundred forty-two".