77746168901 has 4 divisors (see below), whose sum is σ = 82319472972. Its totient is φ = 73172864832.

The previous prime is 77746168889. The next prime is 77746168919. The reversal of 77746168901 is 10986164777.

It is a Cunningham number, because it is equal to 278830²+1.

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 60528792676 + 17217376225 = 246026^2 + 131215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77746168901 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 (77746168931) 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, 2286652010 + ... + 2286652043.

It is an arithmetic number, because the mean of its divisors is an integer number (20579868243).

Almost surely, 2^77746168901 is an apocalyptic number.

It is an amenable number.

77746168901 is a deficient number, since it is larger than the sum of its proper divisors (4573304071).

77746168901 is a wasteful number, since it uses less digits than its factorization.

77746168901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4573304070.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 77746168901 in words is "seventy-seven billion, seven hundred forty-six million, one hundred sixty-eight thousand, nine hundred one".