1661137185 has 8 divisors (see below), whose sum is σ = 2657819520. Its totient is φ = 885939824.

The previous prime is 1661137129. The next prime is 1661137249. The reversal of 1661137185 is 5817311661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661137185 - 2⁷ = 1661137057 is a prime.

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, 55371225 + ... + 55371254.

It is an arithmetic number, because the mean of its divisors is an integer number (332227440).

Almost surely, 2^1661137185 is an apocalyptic number.

1661137185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1661137185 is a deficient number, since it is larger than the sum of its proper divisors (996682335).

1661137185 is a wasteful number, since it uses less digits than its factorization.

1661137185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110742487.

The product of its digits is 30240, while the sum is 39.

The square root of 1661137185 is about 40757.0507397186. The cubic root of 1661137185 is about 1184.3184636955.

The spelling of 1661137185 in words is "one billion, six hundred sixty-one million, one hundred thirty-seven thousand, one hundred eighty-five".