1665858145 has 48 divisors (see below), whose sum is σ = 2451368448. Its totient is φ = 1081449600.

The previous prime is 1665858133. The next prime is 1665858199. The reversal of 1665858145 is 5418585661.

It is a happy number.

It is not a de Polignac number, because 1665858145 - 2⁵ = 1665858113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 567672 + ... + 570598.

It is an arithmetic number, because the mean of its divisors is an integer number (51070176).

Almost surely, 2^1665858145 is an apocalyptic number.

It is an amenable number.

1665858145 is a deficient number, since it is larger than the sum of its proper divisors (785510303).

1665858145 is a wasteful number, since it uses less digits than its factorization.

1665858145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070 (or 3063 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 49.

The square root of 1665858145 is about 40814.9255175114. The cubic root of 1665858145 is about 1185.4393487993.

The spelling of 1665858145 in words is "one billion, six hundred sixty-five million, eight hundred fifty-eight thousand, one hundred forty-five".