27661726409 has 16 divisors (see below), whose sum is σ = 30154018752. Its totient is φ = 25272995328.

The previous prime is 27661726397. The next prime is 27661726471. The reversal of 27661726409 is 90462716672.

It is a de Polignac number, because none of the positive numbers 2^k-27661726409 is a prime.

It is a super-2 number, since 2×27661726409² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27661326409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3077 + ... + 235229.

It is an arithmetic number, because the mean of its divisors is an integer number (1884626172).

Almost surely, 2^27661726409 is an apocalyptic number.

It is an amenable number.

27661726409 is a deficient number, since it is larger than the sum of its proper divisors (2492292343).

27661726409 is a wasteful number, since it uses less digits than its factorization.

27661726409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232376.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 27661726409 in words is "twenty-seven billion, six hundred sixty-one million, seven hundred twenty-six thousand, four hundred nine".