65900019091 has 2 divisors, whose sum is σ = 65900019092. Its totient is φ = 65900019090.

The previous prime is 65900019067. The next prime is 65900019151. The reversal of 65900019091 is 19091000956.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65900019091 - 2⁹ = 65900018579 is a prime.

It is not a weakly prime, because it can be changed into another prime (65900011091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32950009545 + 32950009546.

It is an arithmetic number, because the mean of its divisors is an integer number (32950009546).

Almost surely, 2^65900019091 is an apocalyptic number.

65900019091 is a deficient number, since it is larger than the sum of its proper divisors (1).

65900019091 is an equidigital number, since it uses as much as digits as its factorization.

65900019091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 40.

The spelling of 65900019091 in words is "sixty-five billion, nine hundred million, nineteen thousand, ninety-one".