2106156555 has 48 divisors (see below), whose sum is σ = 3932248320. Its totient is φ = 1039397184.

The previous prime is 2106156509. The next prime is 2106156557. The reversal of 2106156555 is 5556516012.

It is not a de Polignac number, because 2106156555 - 2¹² = 2106152459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2106156557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8122 + ... + 65408.

It is an arithmetic number, because the mean of its divisors is an integer number (81921840).

Almost surely, 2^2106156555 is an apocalyptic number.

2106156555 is a deficient number, since it is larger than the sum of its proper divisors (1826091765).

2106156555 is a wasteful number, since it uses less digits than its factorization.

2106156555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57360 (or 57357 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 2106156555 is about 45892.8813107218. The cubic root of 2106156555 is about 1281.8293656445.

The spelling of 2106156555 in words is "two billion, one hundred six million, one hundred fifty-six thousand, five hundred fifty-five".