2155656671 has 8 divisors (see below), whose sum is σ = 2464116384. Its totient is φ = 1847324160.

The previous prime is 2155656611. The next prime is 2155656689. The reversal of 2155656671 is 1766565512.

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

It is a cyclic number.

It is not a de Polignac number, because 2155656671 - 2²² = 2151462367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155656611) 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, 7811 + ... + 66123.

It is an arithmetic number, because the mean of its divisors is an integer number (308014548).

Almost surely, 2^2155656671 is an apocalyptic number.

2155656671 is a deficient number, since it is larger than the sum of its proper divisors (308459713).

2155656671 is an equidigital number, since it uses as much as digits as its factorization.

2155656671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63601.

The product of its digits is 378000, while the sum is 44.

The square root of 2155656671 is about 46429.0498610514. The cubic root of 2155656671 is about 1291.7938049774.

The spelling of 2155656671 in words is "two billion, one hundred fifty-five million, six hundred fifty-six thousand, six hundred seventy-one".