1681156158 has 64 divisors (see below), whose sum is σ = 3959539200. Its totient is φ = 470476160.

The previous prime is 1681156153. The next prime is 1681156171. The reversal of 1681156158 is 8516511861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681156151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24928 + ... + 63116.

It is an arithmetic number, because the mean of its divisors is an integer number (61867800).

Almost surely, 2^1681156158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1681156158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1979769600).

1681156158 is an abundant number, since it is smaller than the sum of its proper divisors (2278383042).

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

1681156158 is a wasteful number, since it uses less digits than its factorization.

1681156158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38257.

The product of its digits is 57600, while the sum is 42.

The square root of 1681156158 is about 41001.9043216288. The cubic root of 1681156158 is about 1189.0570309130.

The spelling of 1681156158 in words is "one billion, six hundred eighty-one million, one hundred fifty-six thousand, one hundred fifty-eight".