68162495781 has 12 divisors (see below), whose sum is σ = 94125304832. Its totient is φ = 43874708304.

The previous prime is 68162495773. The next prime is 68162495789. The reversal of 68162495781 is 18759426186.

It is an interprime number because it is at equal distance from previous prime (68162495773) and next prime (68162495789).

It is not a de Polignac number, because 68162495781 - 2³ = 68162495773 is a prime.

It is a super-2 number, since 2×68162495781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68162495789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13505701 + ... + 13510746.

Almost surely, 2^68162495781 is an apocalyptic number.

It is an amenable number.

68162495781 is a deficient number, since it is larger than the sum of its proper divisors (25962809051).

68162495781 is a wasteful number, since it uses less digits than its factorization.

68162495781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27016508 (or 27016479 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 57.

The spelling of 68162495781 in words is "sixty-eight billion, one hundred sixty-two million, four hundred ninety-five thousand, seven hundred eighty-one".