77584972361 has 4 divisors (see below), whose sum is σ = 83553047172. Its totient is φ = 71616897552.

The previous prime is 77584972337. The next prime is 77584972403. The reversal of 77584972361 is 16327948577.

It is a happy number.

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 35895091600 + 41689880761 = 189460^2 + 204181^2 .

It is a cyclic number.

It is not a de Polignac number, because 77584972361 - 2¹⁴ = 77584955977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77584972361.

It is not an unprimeable number, because it can be changed into a prime (77584972331) 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, 2984037386 + ... + 2984037411.

It is an arithmetic number, because the mean of its divisors is an integer number (20888261793).

Almost surely, 2^77584972361 is an apocalyptic number.

It is an amenable number.

77584972361 is a deficient number, since it is larger than the sum of its proper divisors (5968074811).

77584972361 is a wasteful number, since it uses less digits than its factorization.

77584972361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5968074810.

The product of its digits is 17781120, while the sum is 59.

The spelling of 77584972361 in words is "seventy-seven billion, five hundred eighty-four million, nine hundred seventy-two thousand, three hundred sixty-one".