77454381679 has 4 divisors (see below), whose sum is σ = 79547743384. Its totient is φ = 75361019976.

The previous prime is 77454381677. The next prime is 77454381691. The reversal of 77454381679 is 97618345477.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77454381679 - 2¹ = 77454381677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77454381673) 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, 1046680797 + ... + 1046680870.

It is an arithmetic number, because the mean of its divisors is an integer number (19886935846).

Almost surely, 2^77454381679 is an apocalyptic number.

77454381679 is a deficient number, since it is larger than the sum of its proper divisors (2093361705).

77454381679 is a wasteful number, since it uses less digits than its factorization.

77454381679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093361704.

The product of its digits is 35562240, while the sum is 61.

The spelling of 77454381679 in words is "seventy-seven billion, four hundred fifty-four million, three hundred eighty-one thousand, six hundred seventy-nine".