77956630749 has 12 divisors (see below), whose sum is σ = 116486919900. Its totient is φ = 50178980544.

The previous prime is 77956630747. The next prime is 77956630753. The reversal of 77956630749 is 94703665977.

It can be written as a sum of positive squares in 2 ways, for example, as 47920274649 + 30036356100 = 218907^2 + 173310^2 .

It is not a de Polignac number, because 77956630749 - 2¹ = 77956630747 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77956630747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149341944 + ... + 149342465.

It is an arithmetic number, because the mean of its divisors is an integer number (9707243325).

Almost surely, 2^77956630749 is an apocalyptic number.

It is an amenable number.

77956630749 is a deficient number, since it is larger than the sum of its proper divisors (38530289151).

77956630749 is a wasteful number, since it uses less digits than its factorization.

77956630749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298684444 (or 298684441 counting only the distinct ones).

The product of its (nonzero) digits is 60011280, while the sum is 63.

The spelling of 77956630749 in words is "seventy-seven billion, nine hundred fifty-six million, six hundred thirty thousand, seven hundred forty-nine".