77448606639121 has 3 divisors (see below), whose sum is σ = 77448615439611. Its totient is φ = 77448597838632.

The previous prime is 77448606639073. The next prime is 77448606639133. The reversal of 77448606639121 is 12193660684477.

The square root of 77448606639121 is 8800489.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 67523838509521 + 9924768129600 = 8217289^2 + 3150360^2 .

It is not a de Polignac number, because 77448606639121 - 2²⁷ = 77448472421393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77458606639121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4400245 + ... + 13200733.

It is an arithmetic number, because the mean of its divisors is an integer number (25816205146537).

Almost surely, 2^{77448606639121} is an apocalyptic number.

77448606639121 is the 8800489-th square number.

77448606639121 is the 4400245-th centered octagonal number.

It is an amenable number.

77448606639121 is a deficient number, since it is larger than the sum of its proper divisors (8800490).

77448606639121 is an frugal number, since it uses more digits than its factorization.

77448606639121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17600978 (or 8800489 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 64.

The spelling of 77448606639121 in words is "seventy-seven trillion, four hundred forty-eight billion, six hundred six million, six hundred thirty-nine thousand, one hundred twenty-one".