73978539499 has 2 divisors, whose sum is σ = 73978539500. Its totient is φ = 73978539498.

The previous prime is 73978539421. The next prime is 73978539529. The reversal of 73978539499 is 99493587937.

It is a strong prime.

It is an emirp because it is prime and its reverse (99493587937) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73978539499 - 2¹⁵ = 73978506731 is a prime.

It is not a weakly prime, because it can be changed into another prime (73978539409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36989269749 + 36989269750.

It is an arithmetic number, because the mean of its divisors is an integer number (36989269750).

Almost surely, 2^73978539499 is an apocalyptic number.

73978539499 is a deficient number, since it is larger than the sum of its proper divisors (1).

73978539499 is an equidigital number, since it uses as much as digits as its factorization.

73978539499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 462944160, while the sum is 73.

The spelling of 73978539499 in words is "seventy-three billion, nine hundred seventy-eight million, five hundred thirty-nine thousand, four hundred ninety-nine".