77493439477 has 8 divisors (see below), whose sum is σ = 78596607960. Its totient is φ = 76396857600.

The previous prime is 77493439459. The next prime is 77493439511.

77493439477 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 12493427076 + 65000012401 = 111774^2 + 254951^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77493439477 - 2¹⁹ = 77492915189 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 (77493439417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1622952 + ... + 1670017.

It is an arithmetic number, because the mean of its divisors is an integer number (9824575995).

Almost surely, 2^77493439477 is an apocalyptic number.

It is an amenable number.

77493439477 is a deficient number, since it is larger than the sum of its proper divisors (1103168483).

77493439477 is a wasteful number, since it uses less digits than its factorization.

77493439477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293303.

The product of its digits is 112021056, while the sum is 64.

The spelling of 77493439477 in words is "seventy-seven billion, four hundred ninety-three million, four hundred thirty-nine thousand, four hundred seventy-seven".