77332167221 has 8 divisors (see below), whose sum is σ = 82014703704. Its totient is φ = 72664473600.

The previous prime is 77332167203. The next prime is 77332167257. The reversal of 77332167221 is 12276123377.

It can be written as a sum of positive squares in 4 ways, for example, as 21806428900 + 55525738321 = 147670^2 + 235639^2 .

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

It is not a de Polignac number, because 77332167221 - 2¹⁴ = 77332150837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77332107221) 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, 3699980 + ... + 3720821.

It is an arithmetic number, because the mean of its divisors is an integer number (10251837963).

Almost surely, 2^77332167221 is an apocalyptic number.

It is an amenable number.

77332167221 is a deficient number, since it is larger than the sum of its proper divisors (4682536483).

77332167221 is a wasteful number, since it uses less digits than its factorization.

77332167221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7421431.

The product of its digits is 148176, while the sum is 41.

The spelling of 77332167221 in words is "seventy-seven billion, three hundred thirty-two million, one hundred sixty-seven thousand, two hundred twenty-one".