43278833661 has 16 divisors (see below), whose sum is σ = 66101019264. Its totient is φ = 24673641984.

The previous prime is 43278833657. The next prime is 43278833687. The reversal of 43278833661 is 16633887234.

It is not a de Polignac number, because 43278833661 - 2² = 43278833657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43278833161) 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, 2370696 + ... + 2388881.

It is an arithmetic number, because the mean of its divisors is an integer number (4131313704).

Almost surely, 2^43278833661 is an apocalyptic number.

It is an amenable number.

43278833661 is a deficient number, since it is larger than the sum of its proper divisors (22822185603).

43278833661 is a wasteful number, since it uses less digits than its factorization.

43278833661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4760020.

The product of its digits is 3483648, while the sum is 51.

The spelling of 43278833661 in words is "forty-three billion, two hundred seventy-eight million, eight hundred thirty-three thousand, six hundred sixty-one".