1645255626 has 32 divisors (see below), whose sum is σ = 3852309888. Its totient is φ = 458607360.

The previous prime is 1645255613. The next prime is 1645255643. The reversal of 1645255626 is 6265525461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475995 + ... + 479438.

It is an arithmetic number, because the mean of its divisors is an integer number (120384684).

Almost surely, 2^1645255626 is an apocalyptic number.

1645255626 is an abundant number, since it is smaller than the sum of its proper divisors (2207054262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645255626 is a wasteful number, since it uses less digits than its factorization.

1645255626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955486.

The product of its digits is 432000, while the sum is 42.

The square root of 1645255626 is about 40561.7507758233. The cubic root of 1645255626 is about 1180.5320845604.

The spelling of 1645255626 in words is "one billion, six hundred forty-five million, two hundred fifty-five thousand, six hundred twenty-six".