2155706061 has 4 divisors (see below), whose sum is σ = 2874274752. Its totient is φ = 1437137372.

The previous prime is 2155706051. The next prime is 2155706071. The reversal of 2155706061 is 1606075512.

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 an interprime number because it is at equal distance from previous prime (2155706051) and next prime (2155706071).

It is a cyclic number.

It is not a de Polignac number, because 2155706061 - 2¹¹ = 2155704013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155706041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359284341 + ... + 359284346.

It is an arithmetic number, because the mean of its divisors is an integer number (718568688).

Almost surely, 2^2155706061 is an apocalyptic number.

It is an amenable number.

2155706061 is a deficient number, since it is larger than the sum of its proper divisors (718568691).

2155706061 is an equidigital number, since it uses as much as digits as its factorization.

2155706061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718568690.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 2155706061 is about 46429.5817448316. The cubic root of 2155706061 is about 1291.8036706809.

The spelling of 2155706061 in words is "two billion, one hundred fifty-five million, seven hundred six thousand, sixty-one".