1660191255 has 64 divisors (see below), whose sum is σ = 2991744000. Its totient is φ = 873452160.

The previous prime is 1660191251. The next prime is 1660191259. The reversal of 1660191255 is 5521910661.

It is an interprime number because it is at equal distance from previous prime (1660191251) and next prime (1660191259).

It is not a de Polignac number, because 1660191255 - 2² = 1660191251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660191251) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4756821 + ... + 4757169.

It is an arithmetic number, because the mean of its divisors is an integer number (46746000).

Almost surely, 2^1660191255 is an apocalyptic number.

1660191255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1660191255 is a deficient number, since it is larger than the sum of its proper divisors (1331552745).

1660191255 is a wasteful number, since it uses less digits than its factorization.

1660191255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 735 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 1660191255 is about 40745.4445920032. Note that the first 3 decimals coincide. The cubic root of 1660191255 is about 1184.0936187140.

The spelling of 1660191255 in words is "one billion, six hundred sixty million, one hundred ninety-one thousand, two hundred fifty-five".