77744437773771 has 16 divisors (see below), whose sum is σ = 109115386976000. Its totient is φ = 49101576206688.

The previous prime is 77744437773767. The next prime is 77744437773799. The reversal of 77744437773771 is 17737773444777.

It is not a de Polignac number, because 77744437773771 - 2² = 77744437773767 is a prime.

It is a super-2 number, since 2×77744437773771² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (75) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 77744437773693 and 77744437773702.

It is not an unprimeable number, because it can be changed into a prime (77744437773731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14891130 + ... + 19422528.

It is an arithmetic number, because the mean of its divisors is an integer number (6819711686000).

Almost surely, 2^{77744437773771} is an apocalyptic number.

77744437773771 is a deficient number, since it is larger than the sum of its proper divisors (31370949202229).

77744437773771 is a wasteful number, since it uses less digits than its factorization.

77744437773771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832418.

The product of its digits is 3320525376, while the sum is 75.

The spelling of 77744437773771 in words is "seventy-seven trillion, seven hundred forty-four billion, four hundred thirty-seven million, seven hundred seventy-three thousand, seven hundred seventy-one".