1645532156 has 12 divisors (see below), whose sum is σ = 2880561600. Its totient is φ = 822514560.

The previous prime is 1645532149. The next prime is 1645532167. The reversal of 1645532156 is 6512355461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47756 + ... + 74643.

It is an arithmetic number, because the mean of its divisors is an integer number (240046800).

Almost surely, 2^1645532156 is an apocalyptic number.

It is an amenable number.

1645532156 is a deficient number, since it is larger than the sum of its proper divisors (1235029444).

1645532156 is a wasteful number, since it uses less digits than its factorization.

1645532156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125764 (or 125762 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 1645532156 is about 40565.1593858572. The cubic root of 1645532156 is about 1180.5982210408.

The spelling of 1645532156 in words is "one billion, six hundred forty-five million, five hundred thirty-two thousand, one hundred fifty-six".