65871997 has 2 divisors, whose sum is σ = 65871998. Its totient is φ = 65871996.

The previous prime is 65871959. The next prime is 65872007. The reversal of 65871997 is 79917856.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65383396 + 488601 = 8086^2 + 699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65871997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65871937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32935998 + 32935999.

It is an arithmetic number, because the mean of its divisors is an integer number (32935999).

Almost surely, 2^65871997 is an apocalyptic number.

It is an amenable number.

65871997 is a deficient number, since it is larger than the sum of its proper divisors (1).

65871997 is an equidigital number, since it uses as much as digits as its factorization.

65871997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 52.

The square root of 65871997 is about 8116.1565411222. The cubic root of 65871997 is about 403.8625749788.

The spelling of 65871997 in words is "sixty-five million, eight hundred seventy-one thousand, nine hundred ninety-seven".