77335448681 has 4 divisors (see below), whose sum is σ = 77336005764. Its totient is φ = 77334891600.

The previous prime is 77335448581. The next prime is 77335448741. The reversal of 77335448681 is 18684453377.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 15999973081 + 61335475600 = 126491^2 + 247660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77335448681 is a prime.

It is a super-2 number, since 2×77335448681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77335448581) 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, 115571 + ... + 409911.

It is an arithmetic number, because the mean of its divisors is an integer number (19334001441).

Almost surely, 2^77335448681 is an apocalyptic number.

It is an amenable number.

77335448681 is a deficient number, since it is larger than the sum of its proper divisors (557083).

77335448681 is a wasteful number, since it uses less digits than its factorization.

77335448681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557082.

The product of its digits is 13547520, while the sum is 56.

The spelling of 77335448681 in words is "seventy-seven billion, three hundred thirty-five million, four hundred forty-eight thousand, six hundred eighty-one".