77315808149 has 8 divisors (see below), whose sum is σ = 78811301592. Its totient is φ = 75821674240.

The previous prime is 77315808133. The next prime is 77315808187. The reversal of 77315808149 is 94180851377.

It can be written as a sum of positive squares in 4 ways, for example, as 7804485649 + 69511322500 = 88343^2 + 263650^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77315808149 - 2⁴ = 77315808133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77315808149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77315808749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224672 + ... + 452889.

It is an arithmetic number, because the mean of its divisors is an integer number (9851412699).

Almost surely, 2^77315808149 is an apocalyptic number.

It is an amenable number.

77315808149 is a deficient number, since it is larger than the sum of its proper divisors (1495493443).

77315808149 is a wasteful number, since it uses less digits than its factorization.

77315808149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679767.

The product of its (nonzero) digits is 1693440, while the sum is 53.

The spelling of 77315808149 in words is "seventy-seven billion, three hundred fifteen million, eight hundred eight thousand, one hundred forty-nine".