1665542043 has 12 divisors (see below), whose sum is σ = 2624490648. Its totient is φ = 1009419360.

The previous prime is 1665542041. The next prime is 1665542059. The reversal of 1665542043 is 3402455661.

1665542043 is a `hidden beast` number, since 1 + 66 + 554 + 2 + 0 + 43 = 666.

It is not a de Polignac number, because 1665542043 - 2¹ = 1665542041 is a prime.

It is a super-2 number, since 2×1665542043² = 5548060594001227698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1665541989 and 1665542007.

It is not an unprimeable number, because it can be changed into a prime (1665542041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8411730 + ... + 8411927.

It is an arithmetic number, because the mean of its divisors is an integer number (218707554).

Almost surely, 2^1665542043 is an apocalyptic number.

1665542043 is a deficient number, since it is larger than the sum of its proper divisors (958948605).

1665542043 is a wasteful number, since it uses less digits than its factorization.

1665542043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16823674 (or 16823671 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 1665542043 is about 40811.0529513758. The cubic root of 1665542043 is about 1185.3643637324.

The spelling of 1665542043 in words is "one billion, six hundred sixty-five million, five hundred forty-two thousand, forty-three".