1665572131 has 8 divisors (see below), whose sum is σ = 1711108080. Its totient is φ = 1620063648.

The previous prime is 1665572101. The next prime is 1665572141. The reversal of 1665572131 is 1312755661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1665572131 - 2⁵ = 1665572099 is a prime.

It is a super-2 number, since 2×1665572131² = 5548261047127762322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665572101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198540 + ... + 206758.

It is an arithmetic number, because the mean of its divisors is an integer number (213888510).

Almost surely, 2^1665572131 is an apocalyptic number.

1665572131 is a deficient number, since it is larger than the sum of its proper divisors (45535949).

1665572131 is an equidigital number, since it uses as much as digits as its factorization.

1665572131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13733.

The product of its digits is 37800, while the sum is 37.

The square root of 1665572131 is about 40811.4215753384. The cubic root of 1665572131 is about 1185.3715015545.

The spelling of 1665572131 in words is "one billion, six hundred sixty-five million, five hundred seventy-two thousand, one hundred thirty-one".