1665531051 has 16 divisors (see below), whose sum is σ = 2338563840. Its totient is φ = 1051475040.

The previous prime is 1665531047. The next prime is 1665531067. The reversal of 1665531051 is 1501355661.

It is not a de Polignac number, because 1665531051 - 2² = 1665531047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665531071) 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, 181981 + ... + 190913.

It is an arithmetic number, because the mean of its divisors is an integer number (146160240).

Almost surely, 2^1665531051 is an apocalyptic number.

1665531051 is a deficient number, since it is larger than the sum of its proper divisors (673032789).

1665531051 is a wasteful number, since it uses less digits than its factorization.

1665531051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12226.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 1665531051 is about 40810.9182817540. The cubic root of 1665531051 is about 1185.3617560621.

The spelling of 1665531051 in words is "one billion, six hundred sixty-five million, five hundred thirty-one thousand, fifty-one".