122017665647 has 4 divisors (see below), whose sum is σ = 122073664920. Its totient is φ = 121961666376.

The previous prime is 122017665629. The next prime is 122017665659. The reversal of 122017665647 is 746566710221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746566710221 = 1663 ⋅448927667.

It is a cyclic number.

It is not a de Polignac number, because 122017665647 - 2¹⁰ = 122017664623 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 (122017665617) 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, 27996368 + ... + 28000725.

It is an arithmetic number, because the mean of its divisors is an integer number (30518416230).

Almost surely, 2^122017665647 is an apocalyptic number.

122017665647 is a deficient number, since it is larger than the sum of its proper divisors (55999273).

122017665647 is an equidigital number, since it uses as much as digits as its factorization.

122017665647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55999272.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 122017665647 in words is "one hundred twenty-two billion, seventeen million, six hundred sixty-five thousand, six hundred forty-seven".