77744249851 has 2 divisors, whose sum is σ = 77744249852. Its totient is φ = 77744249850.

The previous prime is 77744249819. The next prime is 77744249879. The reversal of 77744249851 is 15894244777.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77744249851 - 2⁵ = 77744249819 is a prime.

It is not a weakly prime, because it can be changed into another prime (77744249881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38872124925 + 38872124926.

It is an arithmetic number, because the mean of its divisors is an integer number (38872124926).

Almost surely, 2^77744249851 is an apocalyptic number.

77744249851 is a deficient number, since it is larger than the sum of its proper divisors (1).

77744249851 is an equidigital number, since it uses as much as digits as its factorization.

77744249851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15805440, while the sum is 58.

The spelling of 77744249851 in words is "seventy-seven billion, seven hundred forty-four million, two hundred forty-nine thousand, eight hundred fifty-one".