65940991 has 2 divisors, whose sum is σ = 65940992. Its totient is φ = 65940990.

The previous prime is 65940989. The next prime is 65941009. The reversal of 65940991 is 19904956.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65940991 - 2¹ = 65940989 is a prime.

Together with 65940989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65940911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32970495 + 32970496.

It is an arithmetic number, because the mean of its divisors is an integer number (32970496).

Almost surely, 2^65940991 is an apocalyptic number.

65940991 is a deficient number, since it is larger than the sum of its proper divisors (1).

65940991 is an equidigital number, since it uses as much as digits as its factorization.

65940991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 65940991 is about 8120.4058396117. The cubic root of 65940991 is about 404.0035269927.

The spelling of 65940991 in words is "sixty-five million, nine hundred forty thousand, nine hundred ninety-one".