1645403516 has 24 divisors (see below), whose sum is σ = 2892314880. Its totient is φ = 819037872.

The previous prime is 1645403503. The next prime is 1645403527. The reversal of 1645403516 is 6153045461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1155581 + ... + 1157003.

It is an arithmetic number, because the mean of its divisors is an integer number (120513120).

Almost surely, 2^1645403516 is an apocalyptic number.

It is an amenable number.

1645403516 is a deficient number, since it is larger than the sum of its proper divisors (1246911364).

1645403516 is a wasteful number, since it uses less digits than its factorization.

1645403516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513 (or 2511 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1645403516 is about 40563.5737577448. The cubic root of 1645403516 is about 1180.5674556919.

Adding to 1645403516 its reverse (6153045461), we get a palindrome (7798448977).

The spelling of 1645403516 in words is "one billion, six hundred forty-five million, four hundred three thousand, five hundred sixteen".