73057378221 has 24 divisors (see below), whose sum is σ = 109658805984. Its totient is φ = 48605644080.

The previous prime is 73057378213. The next prime is 73057378243. The reversal of 73057378221 is 12287375037.

It is a happy number.

73057378221 is a `hidden beast` number, since 7 + 3 + 0 + 57 + 378 + 221 = 666.

It is not a de Polignac number, because 73057378221 - 2³ = 73057378213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73057378201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 186846 + ... + 425471.

It is an arithmetic number, because the mean of its divisors is an integer number (4569116916).

Almost surely, 2^73057378221 is an apocalyptic number.

It is an amenable number.

73057378221 is a deficient number, since it is larger than the sum of its proper divisors (36601427763).

73057378221 is an equidigital number, since it uses as much as digits as its factorization.

73057378221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612823 (or 612811 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 73057378221 in words is "seventy-three billion, fifty-seven million, three hundred seventy-eight thousand, two hundred twenty-one".