1645564992 has 56 divisors (see below), whose sum is σ = 4543202496. Its totient is φ = 524671488.

The previous prime is 1645564961. The next prime is 1645564993. The reversal of 1645564992 is 2994655461.

It is not an unprimeable number, because it can be changed into a prime (1645564993) 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, 181903 + ... + 190734.

It is an arithmetic number, because the mean of its divisors is an integer number (81128616).

Almost surely, 2^1645564992 is an apocalyptic number.

1645564992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1645564992 is an abundant number, since it is smaller than the sum of its proper divisors (2897637504).

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

1645564992 is a wasteful number, since it uses less digits than its factorization.

1645564992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372675 (or 372665 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 51.

The square root of 1645564992 is about 40565.5641153923. The cubic root of 1645564992 is about 1180.6060737923.

The spelling of 1645564992 in words is "one billion, six hundred forty-five million, five hundred sixty-four thousand, nine hundred ninety-two".