20144676404661 has 16 divisors (see below), whose sum is σ = 27038267667840. Its totient is φ = 13340440108800.

The previous prime is 20144676404653. The next prime is 20144676404663. The reversal of 20144676404661 is 16640467644102.

It is a happy number.

It is not a de Polignac number, because 20144676404661 - 2³ = 20144676404653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144676404663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14638921 + ... + 15955793.

It is an arithmetic number, because the mean of its divisors is an integer number (1689891729240).

Almost surely, 2^{20144676404661} is an apocalyptic number.

It is an amenable number.

20144676404661 is a deficient number, since it is larger than the sum of its proper divisors (6893591263179).

20144676404661 is a wasteful number, since it uses less digits than its factorization.

20144676404661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350796.

The product of its (nonzero) digits is 4644864, while the sum is 51.

The spelling of 20144676404661 in words is "twenty trillion, one hundred forty-four billion, six hundred seventy-six million, four hundred four thousand, six hundred sixty-one".