68047535322649 has 3 divisors (see below), whose sum is σ = 68047543571743. Its totient is φ = 68047527073556.

The previous prime is 68047535322629. The next prime is 68047535322659. The reversal of 68047535322649 is 94622353574086.

The square root of 68047535322649 is 8249093.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2227869686025 + 65819665636624 = 1492605^2 + 8112932^2 .

It is not a de Polignac number, because 68047535322649 - 2⁵ = 68047535322617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68047535322629) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4124547 + ... + 12373639.

Almost surely, 2^{68047535322649} is an apocalyptic number.

68047535322649 is the 8249093-rd square number.

68047535322649 is the 4124547-th centered octagonal number.

It is an amenable number.

68047535322649 is a deficient number, since it is larger than the sum of its proper divisors (8249094).

68047535322649 is an frugal number, since it uses more digits than its factorization.

68047535322649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16498186 (or 8249093 counting only the distinct ones).

The product of its (nonzero) digits is 261273600, while the sum is 64.

The spelling of 68047535322649 in words is "sixty-eight trillion, forty-seven billion, five hundred thirty-five million, three hundred twenty-two thousand, six hundred forty-nine".