1981165010 has 32 divisors (see below), whose sum is σ = 3892276800. Its totient is φ = 720055360.

The previous prime is 1981164949. The next prime is 1981165013. The reversal of 1981165010 is 105611891.

It is not an unprimeable number, because it can be changed into a prime (1981165013) 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, 306896 + ... + 313284.

It is an arithmetic number, because the mean of its divisors is an integer number (121633650).

Almost surely, 2^1981165010 is an apocalyptic number.

1981165010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981165010 is a deficient number, since it is larger than the sum of its proper divisors (1911111790).

1981165010 is a wasteful number, since it uses less digits than its factorization.

1981165010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9226.

The product of its (nonzero) digits is 2160, while the sum is 32.

The square root of 1981165010 is about 44510.2798238789. The cubic root of 1981165010 is about 1255.9534687516.

The spelling of 1981165010 in words is "one billion, nine hundred eighty-one million, one hundred sixty-five thousand, ten".