65801881 has 2 divisors, whose sum is σ = 65801882. Its totient is φ = 65801880.

The previous prime is 65801867. The next prime is 65801893. The reversal of 65801881 is 18810856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37711881 + 28090000 = 6141^2 + 5300^2 .

It is a cyclic number.

It is not a de Polignac number, because 65801881 - 2⁷ = 65801753 is a prime.

It is a super-2 number, since 2×65801881² = 8659775086276322, 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 65801881.

It is not a weakly prime, because it can be changed into another prime (65801851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32900940 + 32900941.

It is an arithmetic number, because the mean of its divisors is an integer number (32900941).

Almost surely, 2^65801881 is an apocalyptic number.

It is an amenable number.

65801881 is a deficient number, since it is larger than the sum of its proper divisors (1).

65801881 is an equidigital number, since it uses as much as digits as its factorization.

65801881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 65801881 is about 8111.8358587930. The cubic root of 65801881 is about 403.7192298915.

Subtracting from 65801881 its reverse (18810856), we obtain a square (46991025 = 6855²).

The spelling of 65801881 in words is "sixty-five million, eight hundred one thousand, eight hundred eighty-one".