355987642609 has 9 divisors (see below), whose sum is σ = 359753940171. Its totient is φ = 352260388800.

The previous prime is 355987642601. The next prime is 355987642627. The reversal of 355987642609 is 906246789553.

The square root of 355987642609 is 596647.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 159852034225 + 196135608384 = 399815^2 + 442872^2 .

It is not a de Polignac number, because 355987642609 - 2³ = 355987642601 is a prime.

It is a super-2 number, since 2×355987642609² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (355987642601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 57871684 + ... + 57877834.

It is an arithmetic number, because the mean of its divisors is an integer number (39972660019).

Almost surely, 2^355987642609 is an apocalyptic number.

355987642609 is the 596647-th square number.

355987642609 is the 298324-th centered octagonal number.

It is an amenable number.

355987642609 is a deficient number, since it is larger than the sum of its proper divisors (3766297562).

355987642609 is an frugal number, since it uses more digits than its factorization.

355987642609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12496 (or 6248 counting only the distinct ones).

The product of its (nonzero) digits is 97977600, while the sum is 64.

Multiplying 355987642609 by its sum of digits (64), we get a square (22783209126976 = 4773176²).

The spelling of 355987642609 in words is "three hundred fifty-five billion, nine hundred eighty-seven million, six hundred forty-two thousand, six hundred nine".