1646140818 has 32 divisors (see below), whose sum is σ = 3765242880. Its totient is φ = 469996560.

The previous prime is 1646140817. The next prime is 1646140849. The reversal of 1646140818 is 8180416461.

It is not an unprimeable number, because it can be changed into a prime (1646140813) 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, 50493 + ... + 76431.

It is an arithmetic number, because the mean of its divisors is an integer number (117663840).

Almost surely, 2^1646140818 is an apocalyptic number.

1646140818 is an abundant number, since it is smaller than the sum of its proper divisors (2119102062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1646140818 is a wasteful number, since it uses less digits than its factorization.

1646140818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27462.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 1646140818 is about 40572.6609677009. The cubic root of 1646140818 is about 1180.7437659924.

The spelling of 1646140818 in words is "one billion, six hundred forty-six million, one hundred forty thousand, eight hundred eighteen".