2155806502 has 4 divisors (see below), whose sum is σ = 3233709756. Its totient is φ = 1077903250.

The previous prime is 2155806493. The next prime is 2155806547. The reversal of 2155806502 is 2056085512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538951624 + ... + 538951627.

It is an arithmetic number, because the mean of its divisors is an integer number (808427439).

Almost surely, 2^2155806502 is an apocalyptic number.

2155806502 is a deficient number, since it is larger than the sum of its proper divisors (1077903254).

2155806502 is a wasteful number, since it uses less digits than its factorization.

2155806502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077903253.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 2155806502 is about 46430.6633810029. The cubic root of 2155806502 is about 1291.8237334096.

The spelling of 2155806502 in words is "two billion, one hundred fifty-five million, eight hundred six thousand, five hundred two".