65940691 has 2 divisors, whose sum is σ = 65940692. Its totient is φ = 65940690.

The previous prime is 65940617. The next prime is 65940709. The reversal of 65940691 is 19604956.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65940691 - 2¹⁷ = 65809619 is a prime.

It is not a weakly prime, because it can be changed into another prime (65940601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32970345 + 32970346.

It is an arithmetic number, because the mean of its divisors is an integer number (32970346).

Almost surely, 2^65940691 is an apocalyptic number.

65940691 is a deficient number, since it is larger than the sum of its proper divisors (1).

65940691 is an equidigital number, since it uses as much as digits as its factorization.

65940691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 65940691 is about 8120.3873676075. The cubic root of 65940691 is about 404.0029143174.

The spelling of 65940691 in words is "sixty-five million, nine hundred forty thousand, six hundred ninety-one".