2165051237220 has 60 divisors (see below), whose sum is σ = 6791845923324. Its totient is φ = 577346996160.

The previous prime is 2165051237197. The next prime is 2165051237249. The reversal of 2165051237220 is 227321505612.

2165051237220 is a `hidden beast` number, since 2 + 1 + 6 + 50 + 512 + 3 + 72 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1603378932516 + 561672304704 = 1266246^2 + 749448^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 19 ways as a sum of consecutive naturals, for example, 668224071 + ... + 668227310.

Almost surely, 2^{2165051237220} is an apocalyptic number.

2165051237220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165051237220 is an abundant number, since it is smaller than the sum of its proper divisors (4626794686104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2165051237220 is a wasteful number, since it uses less digits than its factorization.

2165051237220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336451402 (or 1336451391 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 2165051237220 in words is "two trillion, one hundred sixty-five billion, fifty-one million, two hundred thirty-seven thousand, two hundred twenty".