1661112170 has 16 divisors (see below), whose sum is σ = 3093105960. Its totient is φ = 641532864.

The previous prime is 1661112157. The next prime is 1661112197. The reversal of 1661112170 is 712111661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1623203521 + 37908649 = 40289^2 + 6157^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2863697 + ... + 2864276.

Almost surely, 2^1661112170 is an apocalyptic number.

1661112170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661112170 is a deficient number, since it is larger than the sum of its proper divisors (1431993790).

1661112170 is a wasteful number, since it uses less digits than its factorization.

1661112170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728009.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 1661112170 is about 40756.7438591456. The cubic root of 1661112170 is about 1184.3125187972.

The spelling of 1661112170 in words is "one billion, six hundred sixty-one million, one hundred twelve thousand, one hundred seventy".