27172100661 has 16 divisors (see below), whose sum is σ = 37348249920. Its totient is φ = 17563754880.

The previous prime is 27172100591. The next prime is 27172100693. The reversal of 27172100661 is 16600127172.

It is not a de Polignac number, because 27172100661 - 2²⁷ = 27037882933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27172200661) 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, 1038550 + ... + 1064391.

It is an arithmetic number, because the mean of its divisors is an integer number (2334265620).

Almost surely, 2^27172100661 is an apocalyptic number.

It is an amenable number.

27172100661 is a deficient number, since it is larger than the sum of its proper divisors (10176149259).

27172100661 is a wasteful number, since it uses less digits than its factorization.

27172100661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103076.

The product of its (nonzero) digits is 7056, while the sum is 33.

The spelling of 27172100661 in words is "twenty-seven billion, one hundred seventy-two million, one hundred thousand, six hundred sixty-one".