77373072221 has 8 divisors (see below), whose sum is σ = 81621256320. Its totient is φ = 73142479872.

The previous prime is 77373072199. The next prime is 77373072241. The reversal of 77373072221 is 12227037377.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77373072221 - 2²² = 77368877917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77373072241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4388900 + ... + 4406493.

It is an arithmetic number, because the mean of its divisors is an integer number (10202657040).

Almost surely, 2^77373072221 is an apocalyptic number.

It is an amenable number.

77373072221 is a deficient number, since it is larger than the sum of its proper divisors (4248184099).

77373072221 is a wasteful number, since it uses less digits than its factorization.

77373072221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8795875.

The product of its (nonzero) digits is 172872, while the sum is 41.

The spelling of 77373072221 in words is "seventy-seven billion, three hundred seventy-three million, seventy-two thousand, two hundred twenty-one".