340636816881 has 15 divisors (see below), whose sum is σ = 508860375771. Its totient is φ = 227087709408.

The previous prime is 340636816859. The next prime is 340636816913. The reversal of 340636816881 is 188618636043.

The square root of 340636816881 is 583641.

It is a perfect power (a square), and thus also a powerful number.

340636816881 is a `hidden beast` number, since 3 + 40 + 6 + 368 + 168 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 148372106481 + 192264710400 = 385191^2 + 438480^2 .

It is not a de Polignac number, because 340636816881 - 2¹³ = 340636808689 is a prime.

It is a super-2 number, since 2×340636816881² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (340636816811) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 5220345 + ... + 5285193.

Almost surely, 2^340636816881 is an apocalyptic number.

340636816881 is the 583641-st square number.

340636816881 is the 291821-st centered octagonal number.

It is an amenable number.

340636816881 is a deficient number, since it is larger than the sum of its proper divisors (168223558890).

340636816881 is an frugal number, since it uses more digits than its factorization.

340636816881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129710 (or 64852 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 340636816881 in words is "three hundred forty billion, six hundred thirty-six million, eight hundred sixteen thousand, eight hundred eighty-one".