77727350401643 has 4 divisors (see below), whose sum is σ = 77776953051840. Its totient is φ = 77677747751448.

The previous prime is 77727350401619. The next prime is 77727350401651. The reversal of 77727350401643 is 34610405372777.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77727350401643 - 2⁶ = 77727350401579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77727350491643) 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, 24801322748 + ... + 24801325881.

It is an arithmetic number, because the mean of its divisors is an integer number (19444238262960).

Almost surely, 2^{77727350401643} is an apocalyptic number.

77727350401643 is a deficient number, since it is larger than the sum of its proper divisors (49602650197).

77727350401643 is a wasteful number, since it uses less digits than its factorization.

77727350401643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49602650196.

The product of its (nonzero) digits is 20744640, while the sum is 56.

The spelling of 77727350401643 in words is "seventy-seven trillion, seven hundred twenty-seven billion, three hundred fifty million, four hundred one thousand, six hundred forty-three".