2155738061 has 4 divisors (see below), whose sum is σ = 2170014624. Its totient is φ = 2141461500.

The previous prime is 2155738051. The next prime is 2155738087. The reversal of 2155738061 is 1608375512.

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-2155738061 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 (2155738051) 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, 7138055 + ... + 7138356.

It is an arithmetic number, because the mean of its divisors is an integer number (542503656).

Almost surely, 2^2155738061 is an apocalyptic number.

It is an amenable number.

2155738061 is a deficient number, since it is larger than the sum of its proper divisors (14276563).

2155738061 is a wasteful number, since it uses less digits than its factorization.

2155738061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14276562.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 2155738061 is about 46429.9263514385. The cubic root of 2155738061 is about 1291.8100626335.

The spelling of 2155738061 in words is "two billion, one hundred fifty-five million, seven hundred thirty-eight thousand, sixty-one".