73774403921 has 2 divisors, whose sum is σ = 73774403922. Its totient is φ = 73774403920.

The previous prime is 73774403909. The next prime is 73774403939. The reversal of 73774403921 is 12930447737.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44988531025 + 28785872896 = 212105^2 + 169664^2 .

It is an emirp because it is prime and its reverse (12930447737) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73774403921 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (73774403951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36887201960 + 36887201961.

It is an arithmetic number, because the mean of its divisors is an integer number (36887201961).

Almost surely, 2^73774403921 is an apocalyptic number.

It is an amenable number.

73774403921 is a deficient number, since it is larger than the sum of its proper divisors (1).

73774403921 is an equidigital number, since it uses as much as digits as its factorization.

73774403921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 889056, while the sum is 47.

The spelling of 73774403921 in words is "seventy-three billion, seven hundred seventy-four million, four hundred three thousand, nine hundred twenty-one".