77163644401 has 4 divisors (see below), whose sum is σ = 77298782704. Its totient is φ = 77028506100.

The previous prime is 77163644359. The next prime is 77163644413. The reversal of 77163644401 is 10444636177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10444636177 = 6421 ⋅1626637.

It is a cyclic number.

It is not a de Polignac number, because 77163644401 - 2¹⁹ = 77163120113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77163644431) 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 3 ways as a sum of consecutive naturals, for example, 67568295 + ... + 67569436.

It is an arithmetic number, because the mean of its divisors is an integer number (19324695676).

Almost surely, 2^77163644401 is an apocalyptic number.

It is an amenable number.

77163644401 is a deficient number, since it is larger than the sum of its proper divisors (135138303).

77163644401 is a wasteful number, since it uses less digits than its factorization.

77163644401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135138302.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 77163644401 in words is "seventy-seven billion, one hundred sixty-three million, six hundred forty-four thousand, four hundred one".