65873581 has 2 divisors, whose sum is σ = 65873582. Its totient is φ = 65873580.

The previous prime is 65873557. The next prime is 65873603. The reversal of 65873581 is 18537856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64160100 + 1713481 = 8010^2 + 1309^2 .

It is a cyclic number.

It is not a de Polignac number, because 65873581 - 2¹³ = 65865389 is a prime.

It is a super-2 number, since 2×65873581² = 8678657347527122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65873681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32936790 + 32936791.

It is an arithmetic number, because the mean of its divisors is an integer number (32936791).

Almost surely, 2^65873581 is an apocalyptic number.

It is an amenable number.

65873581 is a deficient number, since it is larger than the sum of its proper divisors (1).

65873581 is an equidigital number, since it uses as much as digits as its factorization.

65873581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 43.

The square root of 65873581 is about 8116.2541236706. The cubic root of 65873581 is about 403.8658121317.

The spelling of 65873581 in words is "sixty-five million, eight hundred seventy-three thousand, five hundred eighty-one".