136006801681 has 3 divisors (see below), whose sum is σ = 136007170473. Its totient is φ = 136006432890.

The previous prime is 136006801663. The next prime is 136006801703. The reversal of 136006801681 is 186108600631.

The square root of 136006801681 is 368791.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 186108600631 = 17 ⋅10947564743.

It is not a de Polignac number, because 136006801681 - 2¹⁵ = 136006768913 is a prime.

It is a super-2 number, since 2×136006801681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136006801631) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 184396 + ... + 553186.

It is an arithmetic number, because the mean of its divisors is an integer number (45335723491).

Almost surely, 2^136006801681 is an apocalyptic number.

136006801681 is the 368791-st square number.

136006801681 is the 184396-th centered octagonal number.

It is an amenable number.

136006801681 is a deficient number, since it is larger than the sum of its proper divisors (368792).

136006801681 is an frugal number, since it uses more digits than its factorization.

136006801681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737582 (or 368791 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 136006801681 in words is "one hundred thirty-six billion, six million, eight hundred one thousand, six hundred eighty-one".