68587943449 has 9 divisors (see below), whose sum is σ = 69300481629. Its totient is φ = 67882665600.

The previous prime is 68587943447. The next prime is 68587943467. The reversal of 68587943449 is 94434978586.

The square root of 68587943449 is 261893.

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

It can be written as a sum of positive squares in 4 ways, for example, as 27837254025 + 40750689424 = 166845^2 + 201868^2 .

It is not a de Polignac number, because 68587943449 - 2¹ = 68587943447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68587943443) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26449897 + ... + 26452489.

Almost surely, 2^68587943449 is an apocalyptic number.

68587943449 is the 261893-rd square number.

68587943449 is the 130947-th centered octagonal number.

It is an amenable number.

68587943449 is a deficient number, since it is larger than the sum of its proper divisors (712538180).

68587943449 is an frugal number, since it uses more digits than its factorization.

68587943449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5388 (or 2694 counting only the distinct ones).

The product of its digits is 209018880, while the sum is 67.

It can be divided in two parts, 68587 and 943449, that added together give a square (1012036 = 1006²).

The spelling of 68587943449 in words is "sixty-eight billion, five hundred eighty-seven million, nine hundred forty-three thousand, four hundred forty-nine".