1645766145 has 24 divisors (see below), whose sum is σ = 2854612800. Its totient is φ = 877141536.

The previous prime is 1645766071. The next prime is 1645766249. The reversal of 1645766145 is 5416675461.

1645766145 is a `hidden beast` number, since 1 + 64 + 576 + 6 + 14 + 5 = 666.

It is not a de Polignac number, because 1645766145 - 2⁸ = 1645765889 is a prime.

It is a super-2 number, since 2×1645766145² = 5417092408056322050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1645766145.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58426 + ... + 81884.

It is an arithmetic number, because the mean of its divisors is an integer number (118942200).

Almost surely, 2^1645766145 is an apocalyptic number.

1645766145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645766145 is a deficient number, since it is larger than the sum of its proper divisors (1208846655).

1645766145 is a wasteful number, since it uses less digits than its factorization.

1645766145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25029 (or 25026 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 1645766145 is about 40568.0433962497. The cubic root of 1645766145 is about 1180.6541773877.

The spelling of 1645766145 in words is "one billion, six hundred forty-five million, seven hundred sixty-six thousand, one hundred forty-five".