68493808451 has 8 divisors (see below), whose sum is σ = 68777478000. Its totient is φ = 68210724640.

The previous prime is 68493808399. The next prime is 68493808463. The reversal of 68493808451 is 15480839486.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 68493808451 - 2²² = 68489614147 is a prime.

It is a super-2 number, since 2×68493808451² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68493808351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88700 + ... + 380598.

It is an arithmetic number, because the mean of its divisors is an integer number (8597184750).

Almost surely, 2^68493808451 is an apocalyptic number.

68493808451 is a deficient number, since it is larger than the sum of its proper divisors (283669549).

68493808451 is a wasteful number, since it uses less digits than its factorization.

68493808451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292869.

The product of its (nonzero) digits is 6635520, while the sum is 56.

The spelling of 68493808451 in words is "sixty-eight billion, four hundred ninety-three million, eight hundred eight thousand, four hundred fifty-one".