1645168156 has 12 divisors (see below), whose sum is σ = 2879328760. Its totient is φ = 822502800.

The previous prime is 1645168139. The next prime is 1645168159. The reversal of 1645168156 is 6518615461.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645168159) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 65410 + ... + 86998.

Almost surely, 2^1645168156 is an apocalyptic number.

It is an amenable number.

1645168156 is a deficient number, since it is larger than the sum of its proper divisors (1234160604).

1645168156 is a wasteful number, since it uses less digits than its factorization.

1645168156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40644 (or 40642 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The square root of 1645168156 is about 40560.6725289411. The cubic root of 1645168156 is about 1180.5111631973.

The spelling of 1645168156 in words is "one billion, six hundred forty-five million, one hundred sixty-eight thousand, one hundred fifty-six".