77345410776321 has 4 divisors (see below), whose sum is σ = 103127214368432. Its totient is φ = 51563607184212.

The previous prime is 77345410776311. The next prime is 77345410776323. The reversal of 77345410776321 is 12367701454377.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-77345410776321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77345410776323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12890901796051 + ... + 12890901796056.

It is an arithmetic number, because the mean of its divisors is an integer number (25781803592108).

Almost surely, 2^{77345410776321} is an apocalyptic number.

It is an amenable number.

77345410776321 is a deficient number, since it is larger than the sum of its proper divisors (25781803592111).

77345410776321 is a wasteful number, since it uses less digits than its factorization.

77345410776321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25781803592110.

The product of its (nonzero) digits is 20744640, while the sum is 57.

The spelling of 77345410776321 in words is "seventy-seven trillion, three hundred forty-five billion, four hundred ten million, seven hundred seventy-six thousand, three hundred twenty-one".