77746324550 has 12 divisors (see below), whose sum is σ = 144608163756. Its totient is φ = 31098529800.

The previous prime is 77746324529. The next prime is 77746324567. The reversal of 77746324550 is 5542364777.

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 1554926491 = 77746324550 / (7 + 7 + 7 + 4 + 6 + 3 + 2 + 4 + 5 + 5 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 777463196 + ... + 777463295.

It is an arithmetic number, because the mean of its divisors is an integer number (12050680313).

Almost surely, 2^77746324550 is an apocalyptic number.

77746324550 is a deficient number, since it is larger than the sum of its proper divisors (66861839206).

77746324550 is a wasteful number, since it uses less digits than its factorization.

77746324550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554926503 (or 1554926498 counting only the distinct ones).

The product of its (nonzero) digits is 4939200, while the sum is 50.

The spelling of 77746324550 in words is "seventy-seven billion, seven hundred forty-six million, three hundred twenty-four thousand, five hundred fifty".