68981576638463 has 4 divisors (see below), whose sum is σ = 71980775622768. Its totient is φ = 65982377654160.

The previous prime is 68981576638453. The next prime is 68981576638517. The reversal of 68981576638463 is 36483667518986.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68981576638463 is a prime.

It is a super-2 number, since 2×68981576638463² (a number of 28 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 (68981576638423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1499599492118 + ... + 1499599492163.

It is an arithmetic number, because the mean of its divisors is an integer number (17995193905692).

Almost surely, 2^{68981576638463} is an apocalyptic number.

68981576638463 is a deficient number, since it is larger than the sum of its proper divisors (2999198984305).

68981576638463 is a wasteful number, since it uses less digits than its factorization.

68981576638463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2999198984304.

The product of its digits is 7524679680, while the sum is 80.

The spelling of 68981576638463 in words is "sixty-eight trillion, nine hundred eighty-one billion, five hundred seventy-six million, six hundred thirty-eight thousand, four hundred sixty-three".