165215736784870 has 32 divisors (see below), whose sum is σ = 310322371166208. Its totient is φ = 63212138756448.

The previous prime is 165215736784817. The next prime is 165215736784871. The reversal of 165215736784870 is 78487637512561.

165215736784870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 165215736784870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165215736784871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12744507 + ... + 22200313.

It is an arithmetic number, because the mean of its divisors is an integer number (9697574098944).

Almost surely, 2^{165215736784870} is an apocalyptic number.

165215736784870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165215736784870 is a deficient number, since it is larger than the sum of its proper divisors (145106634381338).

165215736784870 is a wasteful number, since it uses less digits than its factorization.

165215736784870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9531804.

The product of its (nonzero) digits is 474163200, while the sum is 70.

The spelling of 165215736784870 in words is "one hundred sixty-five trillion, two hundred fifteen billion, seven hundred thirty-six million, seven hundred eighty-four thousand, eight hundred seventy".