1661960218 has 8 divisors (see below), whose sum is σ = 2493646848. Its totient is φ = 830744604.

The previous prime is 1661960213. The next prime is 1661960221. The reversal of 1661960218 is 8120691661.

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

It is a super-4 number, since 4×1661960218⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1661960213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108796 + ... + 123127.

It is an arithmetic number, because the mean of its divisors is an integer number (311705856).

Almost surely, 2^1661960218 is an apocalyptic number.

1661960218 is a deficient number, since it is larger than the sum of its proper divisors (831686630).

1661960218 is a wasteful number, since it uses less digits than its factorization.

1661960218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235508.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1661960218 is about 40767.1463067995. The cubic root of 1661960218 is about 1184.5140269618.

The spelling of 1661960218 in words is "one billion, six hundred sixty-one million, nine hundred sixty thousand, two hundred eighteen".