551020043240 has 32 divisors (see below), whose sum is σ = 1312724222280. Its totient is φ = 207442839552.

The previous prime is 551020043201. The next prime is 551020043267. The reversal of 551020043240 is 42340020155.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 526776930436 + 24243112804 = 725794^2 + 155702^2 .

It is a super-2 number, since 2×551020043240² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405161117 + ... + 405162476.

Almost surely, 2^551020043240 is an apocalyptic number.

It is an amenable number.

551020043240 is an abundant number, since it is smaller than the sum of its proper divisors (761704179040).

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

551020043240 is a wasteful number, since it uses less digits than its factorization.

551020043240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810323621 (or 810323617 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 551020043240 its reverse (42340020155), we get a palindrome (593360063395).

The spelling of 551020043240 in words is "five hundred fifty-one billion, twenty million, forty-three thousand, two hundred forty".