1645071655 has 16 divisors (see below), whose sum is σ = 1988812800. Its totient is φ = 1306277280.

The previous prime is 1645071629. The next prime is 1645071671. The reversal of 1645071655 is 5561705461.

It is not a de Polignac number, because 1645071655 - 2²⁵ = 1611517223 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393466 + ... + 397624.

It is an arithmetic number, because the mean of its divisors is an integer number (124300800).

Almost surely, 2^1645071655 is an apocalyptic number.

1645071655 is a deficient number, since it is larger than the sum of its proper divisors (343741145).

1645071655 is a wasteful number, since it uses less digits than its factorization.

1645071655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4734.

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 1645071655 is about 40559.4829232326. The cubic root of 1645071655 is about 1180.4880809093.

The spelling of 1645071655 in words is "one billion, six hundred forty-five million, seventy-one thousand, six hundred fifty-five".