77921395201 has 8 divisors (see below), whose sum is σ = 83919547880. Its totient is φ = 71923842432.

The previous prime is 77921395193. The next prime is 77921395217. The reversal of 77921395201 is 10259312977.

It can be written as a sum of positive squares in 4 ways, for example, as 5137448976 + 72783946225 = 71676^2 + 269785^2 .

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

It is not a de Polignac number, because 77921395201 - 2³ = 77921395193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77921395301) 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, 140671 + ... + 419083.

It is an arithmetic number, because the mean of its divisors is an integer number (10489943485).

Almost surely, 2^77921395201 is an apocalyptic number.

It is an amenable number.

77921395201 is a deficient number, since it is larger than the sum of its proper divisors (5998152679).

77921395201 is a wasteful number, since it uses less digits than its factorization.

77921395201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299955.

The product of its (nonzero) digits is 238140, while the sum is 46.

The spelling of 77921395201 in words is "seventy-seven billion, nine hundred twenty-one million, three hundred ninety-five thousand, two hundred one".