2251645533 has 32 divisors (see below), whose sum is σ = 3383700480. Its totient is φ = 1498100832.

The previous prime is 2251645531. The next prime is 2251645541. The reversal of 2251645533 is 3355461522.

2251645533 is a `hidden beast` number, since 2 + 2 + 5 + 1 + 645 + 5 + 3 + 3 = 666.

It is not a de Polignac number, because 2251645533 - 2¹ = 2251645531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251645531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1886785 + ... + 1887977.

It is an arithmetic number, because the mean of its divisors is an integer number (105740640).

Almost surely, 2^2251645533 is an apocalyptic number.

It is an amenable number.

2251645533 is a deficient number, since it is larger than the sum of its proper divisors (1132054947).

2251645533 is an frugal number, since it uses more digits than its factorization.

2251645533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077 (or 2059 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The square root of 2251645533 is about 47451.5071731131. The cubic root of 2251645533 is about 1310.6900649236.

The spelling of 2251645533 in words is "two billion, two hundred fifty-one million, six hundred forty-five thousand, five hundred thirty-three".