68421936634 has 12 divisors (see below), whose sum is σ = 109025266734. Its totient is φ = 32198558144.

The previous prime is 68421936593. The next prime is 68421936701. The reversal of 68421936634 is 43663912486.

It can be written as a sum of positive squares in 3 ways, for example, as 65369705625 + 3052231009 = 255675^2 + 55247^2 .

It is a super-2 number, since 2×68421936634² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59187949 + ... + 59189104.

Almost surely, 2^68421936634 is an apocalyptic number.

68421936634 is a deficient number, since it is larger than the sum of its proper divisors (40603330100).

68421936634 is a wasteful number, since it uses less digits than its factorization.

68421936634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118377089 (or 118377072 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 52.

The spelling of 68421936634 in words is "sixty-eight billion, four hundred twenty-one million, nine hundred thirty-six thousand, six hundred thirty-four".