73665565619 has 2 divisors, whose sum is σ = 73665565620. Its totient is φ = 73665565618.

The previous prime is 73665565609. The next prime is 73665565681. The reversal of 73665565619 is 91656556637.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73665565619 is a prime.

It is a super-2 number, since 2×73665565619² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73665565609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36832782809 + 36832782810.

It is an arithmetic number, because the mean of its divisors is an integer number (36832782810).

Almost surely, 2^73665565619 is an apocalyptic number.

73665565619 is a deficient number, since it is larger than the sum of its proper divisors (1).

73665565619 is an equidigital number, since it uses as much as digits as its factorization.

73665565619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618000, while the sum is 59.

The spelling of 73665565619 in words is "seventy-three billion, six hundred sixty-five million, five hundred sixty-five thousand, six hundred nineteen".