1645327655 has 32 divisors (see below), whose sum is σ = 2145308544. Its totient is φ = 1207996416.

The previous prime is 1645327639. The next prime is 1645327657. The reversal of 1645327655 is 5567235461.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1645327655 - 2⁴ = 1645327639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645327657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307967 + ... + 313263.

It is an arithmetic number, because the mean of its divisors is an integer number (67040892).

Almost surely, 2^1645327655 is an apocalyptic number.

1645327655 is a deficient number, since it is larger than the sum of its proper divisors (499980889).

1645327655 is a wasteful number, since it uses less digits than its factorization.

1645327655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5435.

The product of its digits is 756000, while the sum is 44.

The square root of 1645327655 is about 40562.6386592391. The cubic root of 1645327655 is about 1180.5493121376.

The spelling of 1645327655 in words is "one billion, six hundred forty-five million, three hundred twenty-seven thousand, six hundred fifty-five".