27142831672661 has 4 divisors (see below), whose sum is σ = 27142995784800. Its totient is φ = 27142667560524.

The previous prime is 27142831672547. The next prime is 27142831672681. The reversal of 27142831672661 is 16627613824172.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27142831672661 is a prime.

It is a super-2 number, since 2×27142831672661² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27142831672597 and 27142831672606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27142831672681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81807731 + ... + 82138848.

It is an arithmetic number, because the mean of its divisors is an integer number (6785748946200).

Almost surely, 2^{27142831672661} is an apocalyptic number.

It is an amenable number.

27142831672661 is a deficient number, since it is larger than the sum of its proper divisors (164112139).

27142831672661 is a wasteful number, since it uses less digits than its factorization.

27142831672661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164112138.

The product of its digits is 8128512, while the sum is 56.

The spelling of 27142831672661 in words is "twenty-seven trillion, one hundred forty-two billion, eight hundred thirty-one million, six hundred seventy-two thousand, six hundred sixty-one".