551322320540 has 24 divisors (see below), whose sum is σ = 1158331186320. Its totient is φ = 220423344768.

The previous prime is 551322320513. The next prime is 551322320543. The reversal of 551322320540 is 45023223155.

It is a super-2 number, since 2×551322320540² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 551322320497 and 551322320506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551322320543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6556142 + ... + 6639701.

It is an arithmetic number, because the mean of its divisors is an integer number (48263799430).

Almost surely, 2^551322320540 is an apocalyptic number.

It is an amenable number.

551322320540 is an abundant number, since it is smaller than the sum of its proper divisors (607008865780).

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

551322320540 is a wasteful number, since it uses less digits than its factorization.

551322320540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13197941 (or 13197939 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 551322320540 its reverse (45023223155), we get a palindrome (596345543695).

The spelling of 551322320540 in words is "five hundred fifty-one billion, three hundred twenty-two million, three hundred twenty thousand, five hundred forty".