339549778681 has 27 divisors (see below), whose sum is σ = 364709375247. Its totient is φ = 316061361600.

The previous prime is 339549778637. The next prime is 339549778693. The reversal of 339549778681 is 186877945933.

The square root of 339549778681 is 582709.

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

It can be written as a sum of positive squares in only one way, i.e., 264355364025 + 75194414656 = 514155^2 + 274216^2 .

It is not a de Polignac number, because 339549778681 - 2¹¹ = 339549776633 is a prime.

It is a super-2 number, since 2×339549778681² (a number of 24 digits) contains 22 as substring.

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 339549778681.

It is not an unprimeable number, because it can be changed into a prime (339549778621) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1495813890 + ... + 1495814116.

Almost surely, 2^339549778681 is an apocalyptic number.

339549778681 is the 582709-th square number.

339549778681 is the 291355-th centered octagonal number.

It is an amenable number.

339549778681 is a deficient number, since it is larger than the sum of its proper divisors (25159596566).

339549778681 is an frugal number, since it uses more digits than its factorization.

339549778681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 395 counting only the distinct ones).

The product of its digits is 274337280, while the sum is 70.

The spelling of 339549778681 in words is "three hundred thirty-nine billion, five hundred forty-nine million, seven hundred seventy-eight thousand, six hundred eighty-one".