1645369516 has 24 divisors (see below), whose sum is σ = 3396893696. Its totient is φ = 682410960.

The previous prime is 1645369513. The next prime is 1645369519. The reversal of 1645369516 is 6159635461.

It is an interprime number because it is at equal distance from previous prime (1645369513) and next prime (1645369519).

It is not an unprimeable number, because it can be changed into a prime (1645369511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 946926 + ... + 948661.

Almost surely, 2^1645369516 is an apocalyptic number.

It is an amenable number.

1645369516 is an abundant number, since it is smaller than the sum of its proper divisors (1751524180).

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

1645369516 is a wasteful number, since it uses less digits than its factorization.

1645369516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895629 (or 1895627 counting only the distinct ones).

The product of its digits is 583200, while the sum is 46.

The square root of 1645369516 is about 40563.1546603565. The cubic root of 1645369516 is about 1180.5593240351.

The spelling of 1645369516 in words is "one billion, six hundred forty-five million, three hundred sixty-nine thousand, five hundred sixteen".