77248411949 has 4 divisors (see below), whose sum is σ = 78514779420. Its totient is φ = 75982044480.

The previous prime is 77248411931. The next prime is 77248411973. The reversal of 77248411949 is 94911484277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94911484277 = 259867 ⋅365231.

It can be written as a sum of positive squares in 2 ways, for example, as 9809515849 + 67438896100 = 99043^2 + 259690^2 .

It is a cyclic number.

It is not a de Polignac number, because 77248411949 - 2⁸ = 77248411693 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77248411894 and 77248411903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77248417949) 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, 633183644 + ... + 633183765.

It is an arithmetic number, because the mean of its divisors is an integer number (19628694855).

Almost surely, 2^77248411949 is an apocalyptic number.

It is an amenable number.

77248411949 is a deficient number, since it is larger than the sum of its proper divisors (1266367471).

77248411949 is a wasteful number, since it uses less digits than its factorization.

77248411949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266367470.

The product of its digits is 4064256, while the sum is 56.

The spelling of 77248411949 in words is "seventy-seven billion, two hundred forty-eight million, four hundred eleven thousand, nine hundred forty-nine".