77421378233 has 4 divisors (see below), whose sum is σ = 77433559680. Its totient is φ = 77409196788.

The previous prime is 77421378227. The next prime is 77421378241. The reversal of 77421378233 is 33287312477.

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 cyclic number.

It is not a de Polignac number, because 77421378233 - 2³² = 73126410937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77421378533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6081185 + ... + 6093902.

It is an arithmetic number, because the mean of its divisors is an integer number (19358389920).

Almost surely, 2^77421378233 is an apocalyptic number.

It is an amenable number.

77421378233 is a deficient number, since it is larger than the sum of its proper divisors (12181447).

77421378233 is a wasteful number, since it uses less digits than its factorization.

77421378233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12181446.

The product of its digits is 1185408, while the sum is 47.

The spelling of 77421378233 in words is "seventy-seven billion, four hundred twenty-one million, three hundred seventy-eight thousand, two hundred thirty-three".