61440406163 has 4 divisors (see below), whose sum is σ = 65054547720. Its totient is φ = 57826264608.

The previous prime is 61440406133. The next prime is 61440406177. The reversal of 61440406163 is 36160404416.

It is a happy number.

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 61440406163 - 2¹⁰ = 61440405139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61440406133) 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, 1807070753 + ... + 1807070786.

It is an arithmetic number, because the mean of its divisors is an integer number (16263636930).

Almost surely, 2^61440406163 is an apocalyptic number.

61440406163 is a deficient number, since it is larger than the sum of its proper divisors (3614141557).

61440406163 is a wasteful number, since it uses less digits than its factorization.

61440406163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614141556.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 61440406163 in words is "sixty-one billion, four hundred forty million, four hundred six thousand, one hundred sixty-three".