77871274321 has 4 divisors (see below), whose sum is σ = 80383250944. Its totient is φ = 75359297700.

The previous prime is 77871274303. The next prime is 77871274339. The reversal of 77871274321 is 12347217877.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (77871274303) and next prime (77871274339).

It is a cyclic number.

It is not a de Polignac number, because 77871274321 - 2⁵ = 77871274289 is a prime.

It is a super-2 number, since 2×77871274321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77871274391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255988265 + ... + 1255988326.

It is an arithmetic number, because the mean of its divisors is an integer number (20095812736).

Almost surely, 2^77871274321 is an apocalyptic number.

It is an amenable number.

77871274321 is a deficient number, since it is larger than the sum of its proper divisors (2511976623).

77871274321 is a wasteful number, since it uses less digits than its factorization.

77871274321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511976622.

The product of its digits is 921984, while the sum is 49.

The spelling of 77871274321 in words is "seventy-seven billion, eight hundred seventy-one million, two hundred seventy-four thousand, three hundred twenty-one".