64068743638 has 16 divisors (see below), whose sum is σ = 99701910000. Its totient is φ = 30841104672.

The previous prime is 64068743633. The next prime is 64068743657. The reversal of 64068743638 is 83634786046.

It is a super-2 number, since 2×64068743638² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64068743633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1562328 + ... + 1602811.

It is an arithmetic number, because the mean of its divisors is an integer number (6231369375).

Almost surely, 2^64068743638 is an apocalyptic number.

64068743638 is a deficient number, since it is larger than the sum of its proper divisors (35633166362).

64068743638 is a wasteful number, since it uses less digits than its factorization.

64068743638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165519.

The product of its (nonzero) digits is 13934592, while the sum is 55.

The spelling of 64068743638 in words is "sixty-four billion, sixty-eight million, seven hundred forty-three thousand, six hundred thirty-eight".