8161764981 has 16 divisors (see below), whose sum is σ = 11362719744. Its totient is φ = 5201294384.

The previous prime is 8161764973. The next prime is 8161765009. The reversal of 8161764981 is 1894671618.

8161764981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 8161764981 - 2³ = 8161764973 is a prime.

It is a super-2 number, since 2×8161764981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161764881) 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, 74080 + ... + 147686.

It is an arithmetic number, because the mean of its divisors is an integer number (710169984).

Almost surely, 2^8161764981 is an apocalyptic number.

It is an amenable number.

8161764981 is a deficient number, since it is larger than the sum of its proper divisors (3200954763).

8161764981 is a wasteful number, since it uses less digits than its factorization.

8161764981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75240.

The product of its digits is 580608, while the sum is 51.

The square root of 8161764981 is about 90342.4871309175. The cubic root of 8161764981 is about 2013.3905614304.

The spelling of 8161764981 in words is "eight billion, one hundred sixty-one million, seven hundred sixty-four thousand, nine hundred eighty-one".