1645073453 has 8 divisors (see below), whose sum is σ = 1667635200. Its totient is φ = 1622647728.

The previous prime is 1645073431. The next prime is 1645073491. The reversal of 1645073453 is 3543705461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1645073453 - 2²⁶ = 1577964589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645073653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9533 + ... + 58146.

It is an arithmetic number, because the mean of its divisors is an integer number (208454400).

Almost surely, 2^1645073453 is an apocalyptic number.

It is an amenable number.

1645073453 is a deficient number, since it is larger than the sum of its proper divisors (22561747).

1645073453 is a wasteful number, since it uses less digits than its factorization.

1645073453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68011.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 1645073453 is about 40559.5050882034. The cubic root of 1645073453 is about 1180.4885109852.

The spelling of 1645073453 in words is "one billion, six hundred forty-five million, seventy-three thousand, four hundred fifty-three".