2771201661 has 8 divisors (see below), whose sum is σ = 3889405920. Its totient is φ = 1750232592.

The previous prime is 2771201651. The next prime is 2771201683. The reversal of 2771201661 is 1661021772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2771201661 - 2¹⁰ = 2771200637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2771201611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24308730 + ... + 24308843.

It is an arithmetic number, because the mean of its divisors is an integer number (486175740).

Almost surely, 2^2771201661 is an apocalyptic number.

It is an amenable number.

2771201661 is a deficient number, since it is larger than the sum of its proper divisors (1118204259).

2771201661 is a wasteful number, since it uses less digits than its factorization.

2771201661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48617595.

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

The square root of 2771201661 is about 52642.2041806762. The cubic root of 2771201661 is about 1404.6109299546.

The spelling of 2771201661 in words is "two billion, seven hundred seventy-one million, two hundred one thousand, six hundred sixty-one".