2156220551515 has 12 divisors (see below), whose sum is σ = 2730814506864. Its totient is φ = 1634188206096.

The previous prime is 2156220551489. The next prime is 2156220551539. The reversal of 2156220551515 is 5151550226512.

It is a happy number.

It is not a de Polignac number, because 2156220551515 - 2¹¹ = 2156220549467 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 597289207 + ... + 597292816.

It is an arithmetic number, because the mean of its divisors is an integer number (227567875572).

Almost surely, 2^{2156220551515} is an apocalyptic number.

2156220551515 is a deficient number, since it is larger than the sum of its proper divisors (574593955349).

2156220551515 is a wasteful number, since it uses less digits than its factorization.

2156220551515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194582066 (or 1194582047 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 40.

The spelling of 2156220551515 in words is "two trillion, one hundred fifty-six billion, two hundred twenty million, five hundred fifty-one thousand, five hundred fifteen".