2151651655 has 8 divisors (see below), whose sum is σ = 2591800992. Its totient is φ = 1714775328.

The previous prime is 2151651647. The next prime is 2151651661. The reversal of 2151651655 is 5561561512.

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 2151651655 - 2³ = 2151651647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816804 + ... + 819433.

It is an arithmetic number, because the mean of its divisors is an integer number (323975124).

Almost surely, 2^2151651655 is an apocalyptic number.

2151651655 is a deficient number, since it is larger than the sum of its proper divisors (440149337).

2151651655 is a wasteful number, since it uses less digits than its factorization.

2151651655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636505.

The product of its digits is 45000, while the sum is 37.

The square root of 2151651655 is about 46385.8993121832. The cubic root of 2151651655 is about 1290.9932968228.

The spelling of 2151651655 in words is "two billion, one hundred fifty-one million, six hundred fifty-one thousand, six hundred fifty-five".