2165520505707 has 72 divisors (see below), whose sum is σ = 3402987260400. Its totient is φ = 1326385891584.

The previous prime is 2165520505697. The next prime is 2165520505763. The reversal of 2165520505707 is 7075050255612.

2165520505707 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 5 + 20 + 50 + 570 + 7 = 666.

It is not a de Polignac number, because 2165520505707 - 2¹¹ = 2165520503659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165520509707) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 583853769 + ... + 583857477.

It is an arithmetic number, because the mean of its divisors is an integer number (47263711950).

Almost surely, 2^{2165520505707} is an apocalyptic number.

2165520505707 is a deficient number, since it is larger than the sum of its proper divisors (1237466754693).

2165520505707 is a wasteful number, since it uses less digits than its factorization.

2165520505707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5437 (or 5421 counting only the distinct ones).

The product of its (nonzero) digits is 735000, while the sum is 45.

The spelling of 2165520505707 in words is "two trillion, one hundred sixty-five billion, five hundred twenty million, five hundred five thousand, seven hundred seven".