68557356550 has 24 divisors (see below), whose sum is σ = 127543367952. Its totient is φ = 27417204000.

The previous prime is 68557356521. The next prime is 68557356601. The reversal of 68557356550 is 5565375586.

It is a happy number.

It is a super-2 number, since 2×68557356550² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68557356491 and 68557356500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102015 + ... + 384085.

It is an arithmetic number, because the mean of its divisors is an integer number (5314306998).

Almost surely, 2^68557356550 is an apocalyptic number.

68557356550 is a deficient number, since it is larger than the sum of its proper divisors (58986011402).

68557356550 is a wasteful number, since it uses less digits than its factorization.

68557356550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286944 (or 286939 counting only the distinct ones).

The product of its (nonzero) digits is 18900000, while the sum is 55.

The spelling of 68557356550 in words is "sixty-eight billion, five hundred fifty-seven million, three hundred fifty-six thousand, five hundred fifty".