73978931899 has 4 divisors (see below), whose sum is σ = 74053583680. Its totient is φ = 73904280120.

The previous prime is 73978931893. The next prime is 73978931903. The reversal of 73978931899 is 99813987937.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 73978931899 - 2¹⁹ = 73978407611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73978931893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37324404 + ... + 37326385.

It is an arithmetic number, because the mean of its divisors is an integer number (18513395920).

Almost surely, 2^73978931899 is an apocalyptic number.

73978931899 is a deficient number, since it is larger than the sum of its proper divisors (74651781).

73978931899 is an equidigital number, since it uses as much as digits as its factorization.

73978931899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74651780.

The product of its digits is 185177664, while the sum is 73.

The spelling of 73978931899 in words is "seventy-three billion, nine hundred seventy-eight million, nine hundred thirty-one thousand, eight hundred ninety-nine".