1662140881 has 16 divisors (see below), whose sum is σ = 1871674560. Its totient is φ = 1466726400.

The previous prime is 1662140863. The next prime is 1662140903. The reversal of 1662140881 is 1880412661.

It is a cyclic number.

It is not a de Polignac number, because 1662140881 - 2⁵ = 1662140849 is a prime.

It is a super-2 number, since 2×1662140881² = 5525424616582912322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1662140881.

It is not an unprimeable number, because it can be changed into a prime (1662140281) 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, 4806 + ... + 57856.

It is an arithmetic number, because the mean of its divisors is an integer number (116979660).

Almost surely, 2^1662140881 is an apocalyptic number.

It is an amenable number.

1662140881 is a deficient number, since it is larger than the sum of its proper divisors (209533679).

1662140881 is a wasteful number, since it uses less digits than its factorization.

1662140881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53184.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1662140881 is about 40769.3620381776. The cubic root of 1662140881 is about 1184.5569461808.

The spelling of 1662140881 in words is "one billion, six hundred sixty-two million, one hundred forty thousand, eight hundred eighty-one".