551394909522 has 42 divisors (see below), whose sum is σ = 1240135037703. Its totient is φ = 183788851932.

The previous prime is 551394909463. The next prime is 551394909539. The reversal of 551394909522 is 225909493155.

551394909522 is a `hidden beast` number, since 55 + 13 + 9 + 490 + 95 + 2 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 275697454761 + 275697454761 = 525069^2 + 525069^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=525069.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 28344003 + ... + 28363449.

Almost surely, 2^551394909522 is an apocalyptic number.

551394909522 is an abundant number, since it is smaller than the sum of its proper divisors (688740128181).

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

551394909522 is an frugal number, since it uses more digits than its factorization.

551394909522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38914 (or 19452 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 54.

The spelling of 551394909522 in words is "five hundred fifty-one billion, three hundred ninety-four million, nine hundred nine thousand, five hundred twenty-two".