68512539001 has 27 divisors (see below), whose sum is σ = 74034625831. Its totient is φ = 63389325824.

The previous prime is 68512538999. The next prime is 68512539019. The reversal of 68512539001 is 10093521586.

The square root of 68512539001 is 261749.

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

It can be written as a sum of positive squares in 13 ways, for example, as 7691114601 + 60821424400 = 87699^2 + 246620^2 .

It is not a de Polignac number, because 68512539001 - 2¹ = 68512538999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68512539061) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 396026151 + ... + 396026323.

Almost surely, 2^68512539001 is an apocalyptic number.

68512539001 is the 261749-th square number.

68512539001 is the 130875-th centered octagonal number.

It is an amenable number.

68512539001 is a deficient number, since it is larger than the sum of its proper divisors (5522086830).

68512539001 is an frugal number, since it uses more digits than its factorization.

68512539001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 68512539001 in words is "sixty-eight billion, five hundred twelve million, five hundred thirty-nine thousand, one".