42561961218663 has 16 divisors (see below), whose sum is σ = 56769041070816. Its totient is φ = 28364762810880.

The previous prime is 42561961218643. The next prime is 42561961218677. The reversal of 42561961218663 is 36681216916524.

It is not a de Polignac number, because 42561961218663 - 2²¹ = 42561959121511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42561961218597 and 42561961218606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42561961218643) 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, 101459595 + ... + 101878227.

It is an arithmetic number, because the mean of its divisors is an integer number (3548065066926).

Almost surely, 2^{42561961218663} is an apocalyptic number.

42561961218663 is a deficient number, since it is larger than the sum of its proper divisors (14207079852153).

42561961218663 is a wasteful number, since it uses less digits than its factorization.

42561961218663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430354.

The product of its digits is 22394880, while the sum is 60.

The spelling of 42561961218663 in words is "forty-two trillion, five hundred sixty-one billion, nine hundred sixty-one million, two hundred eighteen thousand, six hundred sixty-three".