2205346771681 has 9 divisors (see below), whose sum is σ = 2305436017521. Its totient is φ = 2109429458532.

The previous prime is 2205346771673. The next prime is 2205346771697. The reversal of 2205346771681 is 1861776435022.

The square root of 2205346771681 is 1485041.

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

It is not a de Polignac number, because 2205346771681 - 2³ = 2205346771673 is a prime.

It is a super-2 number, since 2×2205346771681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2205446771681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 34123660 + ... + 34188226.

Almost surely, 2^{2205346771681} is an apocalyptic number.

2205346771681 is the 1485041-st square number.

2205346771681 is the 742521-st centered octagonal number.

It is an amenable number.

2205346771681 is a deficient number, since it is larger than the sum of its proper divisors (100089245840).

2205346771681 is an frugal number, since it uses more digits than its factorization.

2205346771681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129180 (or 64590 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 2205346771681 in words is "two trillion, two hundred five billion, three hundred forty-six million, seven hundred seventy-one thousand, six hundred eighty-one".