73498777921 has 4 divisors (see below), whose sum is σ = 73588084672. Its totient is φ = 73409471172.

The previous prime is 73498777907. The next prime is 73498778011. The reversal of 73498777921 is 12977789437.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12977789437 = 2137 ⋅6072901.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73498777921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73498777321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44652141 + ... + 44653786.

It is an arithmetic number, because the mean of its divisors is an integer number (18397021168).

Almost surely, 2^73498777921 is an apocalyptic number.

It is an amenable number.

73498777921 is a deficient number, since it is larger than the sum of its proper divisors (89306751).

73498777921 is an equidigital number, since it uses as much as digits as its factorization.

73498777921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89306750.

The product of its digits is 37340352, while the sum is 64.

The spelling of 73498777921 in words is "seventy-three billion, four hundred ninety-eight million, seven hundred seventy-seven thousand, nine hundred twenty-one".