162706561821 has 12 divisors (see below), whose sum is σ = 235095981120. Its totient is φ = 108436245000.

The previous prime is 162706561817. The next prime is 162706561847. The reversal of 162706561821 is 128165607261.

162706561821 is a `hidden beast` number, since 1 + 6 + 2 + 7 + 0 + 6 + 5 + 618 + 21 = 666.

It is not a de Polignac number, because 162706561821 - 2² = 162706561817 is a prime.

It is a super-2 number, since 2×162706561821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162706521821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2870055 + ... + 2926196.

It is an arithmetic number, because the mean of its divisors is an integer number (19591331760).

Almost surely, 2^162706561821 is an apocalyptic number.

It is an amenable number.

162706561821 is a deficient number, since it is larger than the sum of its proper divisors (72389419299).

162706561821 is a wasteful number, since it uses less digits than its factorization.

162706561821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5799376 (or 5799373 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 162706561821 in words is "one hundred sixty-two billion, seven hundred six million, five hundred sixty-one thousand, eight hundred twenty-one".