68630194816 has 16 divisors (see below), whose sum is σ = 136724216490. Its totient is φ = 34315097344.

The previous prime is 68630194769. The next prime is 68630194859. The reversal of 68630194816 is 61849103686.

It can be written as a sum of positive squares in only one way, i.e., 64870052416 + 3760142400 = 254696^2 + 61320^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×68630194816² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268086571 + ... + 268086826.

Almost surely, 2^68630194816 is an apocalyptic number.

It is an amenable number.

68630194816 is a deficient number, since it is larger than the sum of its proper divisors (68094021674).

68630194816 is an equidigital number, since it uses as much as digits as its factorization.

68630194816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536173411 (or 536173399 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 68630194816 in words is "sixty-eight billion, six hundred thirty million, one hundred ninety-four thousand, eight hundred sixteen".