68857551824 has 10 divisors (see below), whose sum is σ = 133411506690. Its totient is φ = 34428775904.

The previous prime is 68857551821. The next prime is 68857551911. The reversal of 68857551824 is 42815575886.

It can be written as a sum of positive squares in only one way, i.e., 37895630224 + 30961921600 = 194668^2 + 175960^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68857551821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2151798479 + ... + 2151798510.

It is an arithmetic number, because the mean of its divisors is an integer number (13341150669).

Almost surely, 2^68857551824 is an apocalyptic number.

It is an amenable number.

68857551824 is a deficient number, since it is larger than the sum of its proper divisors (64553954866).

68857551824 is a wasteful number, since it uses less digits than its factorization.

68857551824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4303596997 (or 4303596991 counting only the distinct ones).

The product of its digits is 21504000, while the sum is 59.

The spelling of 68857551824 in words is "sixty-eight billion, eight hundred fifty-seven million, five hundred fifty-one thousand, eight hundred twenty-four".