8161681757628 has 48 divisors (see below), whose sum is σ = 21967891110144. Its totient is φ = 2310115528320.

The previous prime is 8161681757627. The next prime is 8161681757651. The reversal of 8161681757628 is 8267571861618.

It is a super-2 number, since 2×8161681757628² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161681757627) 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, 454023153 + ... + 454041128.

It is an arithmetic number, because the mean of its divisors is an integer number (457664398128).

Almost surely, 2^{8161681757628} is an apocalyptic number.

It is an amenable number.

8161681757628 is an abundant number, since it is smaller than the sum of its proper divisors (13806209352516).

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

8161681757628 is a wasteful number, since it uses less digits than its factorization.

8161681757628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908064402 (or 908064400 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 66.

The spelling of 8161681757628 in words is "eight trillion, one hundred sixty-one billion, six hundred eighty-one million, seven hundred fifty-seven thousand, six hundred twenty-eight".