77855054215313 has 4 divisors (see below), whose sum is σ = 82434763286820. Its totient is φ = 73275345143808.

The previous prime is 77855054215291. The next prime is 77855054215441. The reversal of 77855054215313 is 31351245055877.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50248930467904 + 27606123747409 = 7088648^2 + 5254153^2 .

It is not a de Polignac number, because 77855054215313 - 2¹² = 77855054211217 is a prime.

It is a super-2 number, since 2×77855054215313² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77855054211313) 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, 2289854535728 + ... + 2289854535761.

It is an arithmetic number, because the mean of its divisors is an integer number (20608690821705).

Almost surely, 2^{77855054215313} is an apocalyptic number.

It is an amenable number.

77855054215313 is a deficient number, since it is larger than the sum of its proper divisors (4579709071507).

77855054215313 is a wasteful number, since it uses less digits than its factorization.

77855054215313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4579709071506.

The product of its (nonzero) digits is 17640000, while the sum is 56.

The spelling of 77855054215313 in words is "seventy-seven trillion, eight hundred fifty-five billion, fifty-four million, two hundred fifteen thousand, three hundred thirteen".