1665146255 has 4 divisors (see below), whose sum is σ = 1998175512. Its totient is φ = 1332117000.

The previous prime is 1665146251. The next prime is 1665146269. The reversal of 1665146255 is 5526415661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5526415661 = 13 ⋅425108897.

It is not a de Polignac number, because 1665146255 - 2² = 1665146251 is a prime.

It is a super-3 number, since 3×1665146255³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665146251) 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, 166514621 + ... + 166514630.

It is an arithmetic number, because the mean of its divisors is an integer number (499543878).

Almost surely, 2^1665146255 is an apocalyptic number.

1665146255 is a deficient number, since it is larger than the sum of its proper divisors (333029257).

1665146255 is an equidigital number, since it uses as much as digits as its factorization.

1665146255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333029256.

The product of its digits is 216000, while the sum is 41.

The square root of 1665146255 is about 40806.2036337614. The cubic root of 1665146255 is about 1185.2704623386.

The spelling of 1665146255 in words is "one billion, six hundred sixty-five million, one hundred forty-six thousand, two hundred fifty-five".