1916660201 has 4 divisors (see below), whose sum is σ = 1916747904. Its totient is φ = 1916572500.

The previous prime is 1916660191. The next prime is 1916660209. The reversal of 1916660201 is 1020666191.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1916660201 - 2²² = 1912465897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1916660209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18176 + ... + 64526.

It is an arithmetic number, because the mean of its divisors is an integer number (479186976).

Almost surely, 2^1916660201 is an apocalyptic number.

It is an amenable number.

1916660201 is a deficient number, since it is larger than the sum of its proper divisors (87703).

1916660201 is an equidigital number, since it uses as much as digits as its factorization.

1916660201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87702.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1916660201 is about 43779.6779453664. The cubic root of 1916660201 is about 1242.1719221730.

The spelling of 1916660201 in words is "one billion, nine hundred sixteen million, six hundred sixty thousand, two hundred one".