8161619732 has 18 divisors (see below), whose sum is σ = 16614726282. Its totient is φ = 3497836944.

The previous prime is 8161619707. The next prime is 8161619813. The reversal of 8161619732 is 2379161618.

It can be written as a sum of positive squares in only one way, i.e., 6002530576 + 2159089156 = 77476^2 + 46466^2 .

It is a super-2 number, since 2×8161619732² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20820263 + ... + 20820654.

It is an arithmetic number, because the mean of its divisors is an integer number (923040349).

Almost surely, 2^8161619732 is an apocalyptic number.

It is an amenable number.

8161619732 is an abundant number, since it is smaller than the sum of its proper divisors (8453106550).

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

8161619732 is a wasteful number, since it uses less digits than its factorization.

8161619732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41640935 (or 41640926 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 8161619732 is about 90341.6832475464. The cubic root of 8161619732 is about 2013.3786177433.

The spelling of 8161619732 in words is "eight billion, one hundred sixty-one million, six hundred nineteen thousand, seven hundred thirty-two".