1665016131 has 4 divisors (see below), whose sum is σ = 2220021512. Its totient is φ = 1110010752.

The previous prime is 1665016127. The next prime is 1665016139. The reversal of 1665016131 is 1316105661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1665016131 - 2² = 1665016127 is a prime.

It is a super-2 number, since 2×1665016131² = 5544557432980418322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665016139) 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, 277502686 + ... + 277502691.

It is an arithmetic number, because the mean of its divisors is an integer number (555005378).

Almost surely, 2^1665016131 is an apocalyptic number.

1665016131 is a deficient number, since it is larger than the sum of its proper divisors (555005381).

1665016131 is an equidigital number, since it uses as much as digits as its factorization.

1665016131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555005380.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1665016131 is about 40804.6091881787. The cubic root of 1665016131 is about 1185.2395869424.

The spelling of 1665016131 in words is "one billion, six hundred sixty-five million, sixteen thousand, one hundred thirty-one".