551721072436 has 12 divisors (see below), whose sum is σ = 969074653120. Its totient is φ = 274842600120.

The previous prime is 551721072391. The next prime is 551721072467. The reversal of 551721072436 is 634270127155.

It is a happy number.

It is a super-2 number, since 2×551721072436² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 551721072392 and 551721072401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254482806 + ... + 254484973.

Almost surely, 2^551721072436 is an apocalyptic number.

It is an amenable number.

551721072436 is a deficient number, since it is larger than the sum of its proper divisors (417353580684).

551721072436 is a wasteful number, since it uses less digits than its factorization.

551721072436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508968054 (or 508968052 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 551721072436 in words is "five hundred fifty-one billion, seven hundred twenty-one million, seventy-two thousand, four hundred thirty-six".