68646076561 has 4 divisors (see below), whose sum is σ = 68711392624. Its totient is φ = 68580760500.

The previous prime is 68646076531. The next prime is 68646076573. The reversal of 68646076561 is 16567064686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68646076561 - 2¹¹ = 68646074513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68646076501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32656455 + ... + 32658556.

It is an arithmetic number, because the mean of its divisors is an integer number (17177848156).

Almost surely, 2^68646076561 is an apocalyptic number.

It is an amenable number.

68646076561 is a deficient number, since it is larger than the sum of its proper divisors (65316063).

68646076561 is a wasteful number, since it uses less digits than its factorization.

68646076561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65316062.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 68646076561 in words is "sixty-eight billion, six hundred forty-six million, seventy-six thousand, five hundred sixty-one".