68643532965 has 64 divisors (see below), whose sum is σ = 130112225280. Its totient is φ = 30240241920.

The previous prime is 68643532921. The next prime is 68643533069. The reversal of 68643532965 is 56923534686.

It is not a de Polignac number, because 68643532965 - 2¹² = 68643528869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 733827 + ... + 822063.

It is an arithmetic number, because the mean of its divisors is an integer number (2033003520).

Almost surely, 2^68643532965 is an apocalyptic number.

It is an amenable number.

68643532965 is a deficient number, since it is larger than the sum of its proper divisors (61468692315).

68643532965 is a wasteful number, since it uses less digits than its factorization.

68643532965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88522.

The product of its digits is 27993600, while the sum is 57.

It can be divided in two parts, 686435 and 32965, that added together give a triangular number (719400 = T₁₁₉₉).

The spelling of 68643532965 in words is "sixty-eight billion, six hundred forty-three million, five hundred thirty-two thousand, nine hundred sixty-five".