64893643542 has 96 divisors (see below), whose sum is σ = 175886867520. Its totient is φ = 16834210560.

The previous prime is 64893643511. The next prime is 64893643547. The reversal of 64893643542 is 24534639846.

64893643542 is a `hidden beast` number, since 6 + 4 + 8 + 93 + 6 + 4 + 3 + 542 = 666.

It is a super-2 number, since 2×64893643542² (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 (64893643547) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 224817 + ... + 424652.

It is an arithmetic number, because the mean of its divisors is an integer number (1832154870).

Almost surely, 2^64893643542 is an apocalyptic number.

64893643542 is an abundant number, since it is smaller than the sum of its proper divisors (110993223978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64893643542 is a wasteful number, since it uses less digits than its factorization.

64893643542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649558 (or 649555 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 54.

The spelling of 64893643542 in words is "sixty-four billion, eight hundred ninety-three million, six hundred forty-three thousand, five hundred forty-two".