551004636440 has 16 divisors (see below), whose sum is σ = 1239760432080. Its totient is φ = 220401854560.

The previous prime is 551004636409. The next prime is 551004636443. The reversal of 551004636440 is 44636400155.

It is a super-2 number, since 2×551004636440² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 551004636394 and 551004636403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551004636443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6887557916 + ... + 6887557995.

It is an arithmetic number, because the mean of its divisors is an integer number (77485027005).

Almost surely, 2^551004636440 is an apocalyptic number.

It is an amenable number.

551004636440 is an abundant number, since it is smaller than the sum of its proper divisors (688755795640).

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

551004636440 is a wasteful number, since it uses less digits than its factorization.

551004636440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13775115922 (or 13775115918 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 551004636440 in words is "five hundred fifty-one billion, four million, six hundred thirty-six thousand, four hundred forty".