68538262490 has 8 divisors (see below), whose sum is σ = 123368872500. Its totient is φ = 27415304992.

The previous prime is 68538262477. The next prime is 68538262523. The reversal of 68538262490 is 9426283586.

It can be written as a sum of positive squares in 2 ways, for example, as 66834141529 + 1704120961 = 258523^2 + 41281^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3426913115 + ... + 3426913134.

Almost surely, 2^68538262490 is an apocalyptic number.

68538262490 is a deficient number, since it is larger than the sum of its proper divisors (54830610010).

68538262490 is a wasteful number, since it uses less digits than its factorization.

68538262490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6853826256.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 68538262490 in words is "sixty-eight billion, five hundred thirty-eight million, two hundred sixty-two thousand, four hundred ninety".