83840442661 has 4 divisors (see below), whose sum is σ = 83870485024. Its totient is φ = 83810400300.

The previous prime is 83840442641. The next prime is 83840442709. The reversal of 83840442661 is 16624404838.

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 83840442661 - 2⁵ = 83840442629 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 (83840442641) 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, 15016995 + ... + 15022576.

It is an arithmetic number, because the mean of its divisors is an integer number (20967621256).

Almost surely, 2^83840442661 is an apocalyptic number.

It is an amenable number.

83840442661 is a deficient number, since it is larger than the sum of its proper divisors (30042363).

83840442661 is a wasteful number, since it uses less digits than its factorization.

83840442661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30042362.

The product of its (nonzero) digits is 884736, while the sum is 46.

The spelling of 83840442661 in words is "eighty-three billion, eight hundred forty million, four hundred forty-two thousand, six hundred sixty-one".