20127122460661 has 4 divisors (see below), whose sum is σ = 20138564828800. Its totient is φ = 20115680092524.

The previous prime is 20127122460659. The next prime is 20127122460737. The reversal of 20127122460661 is 16606422172102.

It is a happy number.

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 20127122460661 - 2¹ = 20127122460659 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 (20127122460161) 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, 5721181431 + ... + 5721184948.

It is an arithmetic number, because the mean of its divisors is an integer number (5034641207200).

Almost surely, 2^{20127122460661} is an apocalyptic number.

It is an amenable number.

20127122460661 is a deficient number, since it is larger than the sum of its proper divisors (11442368139).

20127122460661 is a wasteful number, since it uses less digits than its factorization.

20127122460661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11442368138.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 20127122460661 in words is "twenty trillion, one hundred twenty-seven billion, one hundred twenty-two million, four hundred sixty thousand, six hundred sixty-one".