1645465604 has 6 divisors (see below), whose sum is σ = 2879564814. Its totient is φ = 822732800.

The previous prime is 1645465571. The next prime is 1645465631. The reversal of 1645465604 is 4065645461.

It can be written as a sum of positive squares in only one way, i.e., 1636040704 + 9424900 = 40448^2 + 3070^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205683197 + ... + 205683204.

It is an arithmetic number, because the mean of its divisors is an integer number (479927469).

Almost surely, 2^1645465604 is an apocalyptic number.

It is an amenable number.

1645465604 is a deficient number, since it is larger than the sum of its proper divisors (1234099210).

1645465604 is a wasteful number, since it uses less digits than its factorization.

1645465604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411366405 (or 411366403 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 41.

The square root of 1645465604 is about 40564.3390677082. The cubic root of 1645465604 is about 1180.5823047648.

The spelling of 1645465604 in words is "one billion, six hundred forty-five million, four hundred sixty-five thousand, six hundred four".