1645608966 has 16 divisors (see below), whose sum is σ = 3380170224. Its totient is φ = 533710944.

The previous prime is 1645608919. The next prime is 1645608967. The reversal of 1645608966 is 6698065461.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645608967) 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, 3706105 + ... + 3706548.

It is an arithmetic number, because the mean of its divisors is an integer number (211260639).

Almost surely, 2^1645608966 is an apocalyptic number.

1645608966 is an abundant number, since it is smaller than the sum of its proper divisors (1734561258).

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

1645608966 is a wasteful number, since it uses less digits than its factorization.

1645608966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7412695.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 1645608966 is about 40566.1061232157. The cubic root of 1645608966 is about 1180.6165900404.

The spelling of 1645608966 in words is "one billion, six hundred forty-five million, six hundred eight thousand, nine hundred sixty-six".