1645642053 has 12 divisors (see below), whose sum is σ = 2593133088. Its totient is φ = 997358760.

The previous prime is 1645642027. The next prime is 1645642087. The reversal of 1645642053 is 3502465461.

1645642053 is a `hidden beast` number, since 1 + 6 + 4 + 5 + 642 + 0 + 5 + 3 = 666.

It is not a de Polignac number, because 1645642053 - 2⁸ = 1645641797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1645641999 and 1645642017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645642253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8311225 + ... + 8311422.

It is an arithmetic number, because the mean of its divisors is an integer number (216094424).

Almost surely, 2^1645642053 is an apocalyptic number.

It is an amenable number.

1645642053 is a deficient number, since it is larger than the sum of its proper divisors (947491035).

1645642053 is a wasteful number, since it uses less digits than its factorization.

1645642053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16622664 (or 16622661 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 1645642053 is about 40566.5139369900. The cubic root of 1645642053 is about 1180.6245025721.

The spelling of 1645642053 in words is "one billion, six hundred forty-five million, six hundred forty-two thousand, fifty-three".