77444343381 has 4 divisors (see below), whose sum is σ = 103259124512. Its totient is φ = 51629562252.

The previous prime is 77444343341. The next prime is 77444343397. The reversal of 77444343381 is 18334344477.

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 not a de Polignac number, because 77444343381 - 2⁷ = 77444343253 is a prime.

It is a super-2 number, since 2×77444343381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77444343381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77444343341) 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, 12907390561 + ... + 12907390566.

It is an arithmetic number, because the mean of its divisors is an integer number (25814781128).

Almost surely, 2^77444343381 is an apocalyptic number.

It is an amenable number.

77444343381 is a deficient number, since it is larger than the sum of its proper divisors (25814781131).

77444343381 is a wasteful number, since it uses less digits than its factorization.

77444343381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25814781130.

The product of its digits is 2709504, while the sum is 48.

The spelling of 77444343381 in words is "seventy-seven billion, four hundred forty-four million, three hundred forty-three thousand, three hundred eighty-one".