2157061007165 has 4 divisors (see below), whose sum is σ = 2588473208604. Its totient is φ = 1725648805728.

The previous prime is 2157061007141. The next prime is 2157061007197. The reversal of 2157061007165 is 5617001607512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 469571674009 + 1687489333156 = 685253^2 + 1299034^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157061007165 - 2³² = 2152766039869 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 3 ways as a sum of consecutive naturals, for example, 215706100712 + ... + 215706100721.

It is an arithmetic number, because the mean of its divisors is an integer number (647118302151).

Almost surely, 2^{2157061007165} is an apocalyptic number.

It is an amenable number.

2157061007165 is a deficient number, since it is larger than the sum of its proper divisors (431412201439).

2157061007165 is an equidigital number, since it uses as much as digits as its factorization.

2157061007165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431412201438.

The product of its (nonzero) digits is 88200, while the sum is 41.

The spelling of 2157061007165 in words is "two trillion, one hundred fifty-seven billion, sixty-one million, seven thousand, one hundred sixty-five".