73661661739 has 2 divisors, whose sum is σ = 73661661740. Its totient is φ = 73661661738.

The previous prime is 73661661737. The next prime is 73661661779. The reversal of 73661661739 is 93716616637.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 73661661739 - 2¹ = 73661661737 is a prime.

Together with 73661661737, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 73661661739.

It is not a weakly prime, because it can be changed into another prime (73661661737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36830830869 + 36830830870.

It is an arithmetic number, because the mean of its divisors is an integer number (36830830870).

Almost surely, 2^73661661739 is an apocalyptic number.

73661661739 is a deficient number, since it is larger than the sum of its proper divisors (1).

73661661739 is an equidigital number, since it uses as much as digits as its factorization.

73661661739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 55.

The spelling of 73661661739 in words is "seventy-three billion, six hundred sixty-one million, six hundred sixty-one thousand, seven hundred thirty-nine".