1645512051 has 16 divisors (see below), whose sum is σ = 2205415424. Its totient is φ = 1091323584.

The previous prime is 1645512047. The next prime is 1645512061. The reversal of 1645512051 is 1502155461.

It is not a de Polignac number, because 1645512051 - 2² = 1645512047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645512031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 568530 + ... + 571416.

It is an arithmetic number, because the mean of its divisors is an integer number (137838464).

Almost surely, 2^1645512051 is an apocalyptic number.

1645512051 is a deficient number, since it is larger than the sum of its proper divisors (559903373).

1645512051 is a wasteful number, since it uses less digits than its factorization.

1645512051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3810.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 1645512051 is about 40564.9115739206. The cubic root of 1645512051 is about 1180.5934128650.

The spelling of 1645512051 in words is "one billion, six hundred forty-five million, five hundred twelve thousand, fifty-one".