77452859989 has 4 divisors (see below), whose sum is σ = 77900564556. Its totient is φ = 77005155424.

The previous prime is 77452859963. The next prime is 77452859993. The reversal of 77452859989 is 98995825477.

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 74833979364 + 2618880625 = 273558^2 + 51175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77452859989 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 (77452859929) 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, 223852024 + ... + 223852369.

It is an arithmetic number, because the mean of its divisors is an integer number (19475141139).

Almost surely, 2^77452859989 is an apocalyptic number.

It is an amenable number.

77452859989 is a deficient number, since it is larger than the sum of its proper divisors (447704567).

77452859989 is a wasteful number, since it uses less digits than its factorization.

77452859989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447704566.

The product of its digits is 457228800, while the sum is 73.

The spelling of 77452859989 in words is "seventy-seven billion, four hundred fifty-two million, eight hundred fifty-nine thousand, nine hundred eighty-nine".