122684720791 has 4 divisors (see below), whose sum is σ = 124695945784. Its totient is φ = 120673495800.

The previous prime is 122684720789. The next prime is 122684720803. The reversal of 122684720791 is 197027486221.

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

It is a cyclic number.

It is not a de Polignac number, because 122684720791 - 2¹ = 122684720789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122684720761) 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, 1005612405 + ... + 1005612526.

It is an arithmetic number, because the mean of its divisors is an integer number (31173986446).

Almost surely, 2^122684720791 is an apocalyptic number.

122684720791 is a deficient number, since it is larger than the sum of its proper divisors (2011224993).

122684720791 is an equidigital number, since it uses as much as digits as its factorization.

122684720791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011224992.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 122684720791 in words is "one hundred twenty-two billion, six hundred eighty-four million, seven hundred twenty thousand, seven hundred ninety-one".