77459494421 has 4 divisors (see below), whose sum is σ = 80130511500. Its totient is φ = 74788477344.

The previous prime is 77459494393. The next prime is 77459494457. The reversal of 77459494421 is 12449495477.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32864613796 + 44594880625 = 181286^2 + 211175^2 .

It is a cyclic number.

It is not a de Polignac number, because 77459494421 - 2¹⁴ = 77459478037 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 (77459494621) 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, 1335508496 + ... + 1335508553.

It is an arithmetic number, because the mean of its divisors is an integer number (20032627875).

Almost surely, 2^77459494421 is an apocalyptic number.

It is an amenable number.

77459494421 is a deficient number, since it is larger than the sum of its proper divisors (2671017079).

77459494421 is a wasteful number, since it uses less digits than its factorization.

77459494421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671017078.

The product of its digits is 10160640, while the sum is 56.

The spelling of 77459494421 in words is "seventy-seven billion, four hundred fifty-nine million, four hundred ninety-four thousand, four hundred twenty-one".