73998332561 has 4 divisors (see below), whose sum is σ = 77215651392. Its totient is φ = 70781013732.

The previous prime is 73998332549. The next prime is 73998332567. The reversal of 73998332561 is 16523389937.

It is a happy number.

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: 16523389937 = 223 ⋅74095919.

It is a cyclic number.

It is not a de Polignac number, because 73998332561 - 2⁶ = 73998332497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73998332497 and 73998332506.

It is not an unprimeable number, because it can be changed into a prime (73998332567) 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, 1608659381 + ... + 1608659426.

It is an arithmetic number, because the mean of its divisors is an integer number (19303912848).

Almost surely, 2^73998332561 is an apocalyptic number.

It is an amenable number.

73998332561 is a deficient number, since it is larger than the sum of its proper divisors (3217318831).

73998332561 is a wasteful number, since it uses less digits than its factorization.

73998332561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217318830.

The product of its digits is 7348320, while the sum is 56.

The spelling of 73998332561 in words is "seventy-three billion, nine hundred ninety-eight million, three hundred thirty-two thousand, five hundred sixty-one".