1665942231 has 16 divisors (see below), whose sum is σ = 2270304000. Its totient is φ = 1086294528.

The previous prime is 1665942221. The next prime is 1665942241. The reversal of 1665942231 is 1322495661.

It is an interprime number because it is at equal distance from previous prime (1665942221) and next prime (1665942241).

It is not a de Polignac number, because 1665942231 - 2¹⁴ = 1665925847 is a prime.

It is a super-2 number, since 2×1665942231² = 5550727034058514722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1665942231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665942221) 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, 11575 + ... + 58871.

It is an arithmetic number, because the mean of its divisors is an integer number (141894000).

Almost surely, 2^1665942231 is an apocalyptic number.

1665942231 is a deficient number, since it is larger than the sum of its proper divisors (604361769).

1665942231 is a wasteful number, since it uses less digits than its factorization.

1665942231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47558.

The product of its digits is 77760, while the sum is 39.

The square root of 1665942231 is about 40815.9555933706. The cubic root of 1665942231 is about 1185.4592939101.

The spelling of 1665942231 in words is "one billion, six hundred sixty-five million, nine hundred forty-two thousand, two hundred thirty-one".