68769851561 has 4 divisors (see below), whose sum is σ = 68771554500. Its totient is φ = 68768148624.

The previous prime is 68769851533. The next prime is 68769851567. The reversal of 68769851561 is 16515896786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20466163600 + 48303687961 = 143060^2 + 219781^2 .

It is a cyclic number.

It is not a de Polignac number, because 68769851561 - 2⁶ = 68769851497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68769851494 and 68769851503.

It is not an unprimeable number, because it can be changed into a prime (68769851567) 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, 789386 + ... + 872163.

It is an arithmetic number, because the mean of its divisors is an integer number (17192888625).

Almost surely, 2^68769851561 is an apocalyptic number.

It is an amenable number.

68769851561 is a deficient number, since it is larger than the sum of its proper divisors (1702939).

68769851561 is a wasteful number, since it uses less digits than its factorization.

68769851561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702938.

The product of its digits is 21772800, while the sum is 62.

The spelling of 68769851561 in words is "sixty-eight billion, seven hundred sixty-nine million, eight hundred fifty-one thousand, five hundred sixty-one".