446640327991 has 16 divisors (see below), whose sum is σ = 524781250560. Its totient is φ = 374762394720.

The previous prime is 446640327979. The next prime is 446640328019. The reversal of 446640327991 is 199723046644.

It is a cyclic number.

It is not a de Polignac number, because 446640327991 - 2¹⁹ = 446639803703 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 (446640327391) 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, 1190746 + ... + 1520248.

It is an arithmetic number, because the mean of its divisors is an integer number (32798828160).

Almost surely, 2^446640327991 is an apocalyptic number.

446640327991 is a deficient number, since it is larger than the sum of its proper divisors (78140922569).

446640327991 is a wasteful number, since it uses less digits than its factorization.

446640327991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339006.

The product of its (nonzero) digits is 7838208, while the sum is 55.

The spelling of 446640327991 in words is "four hundred forty-six billion, six hundred forty million, three hundred twenty-seven thousand, nine hundred ninety-one".