1660156566 has 8 divisors (see below), whose sum is σ = 3320313144. Its totient is φ = 553385520.

The previous prime is 1660156549. The next prime is 1660156657. The reversal of 1660156566 is 6656510661.

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

1660156566 is an admirable number.

It is a super-2 number, since 2×1660156566² = 5512239647265824712, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138346375 + ... + 138346386.

It is an arithmetic number, because the mean of its divisors is an integer number (415039143).

Almost surely, 2^1660156566 is an apocalyptic number.

1660156566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1660156566 is a wasteful number, since it uses less digits than its factorization.

1660156566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276692766.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 1660156566 is about 40745.0189102914. The cubic root of 1660156566 is about 1184.0853716100.

The spelling of 1660156566 in words is "one billion, six hundred sixty million, one hundred fifty-six thousand, five hundred sixty-six".