1645155453 has 8 divisors (see below), whose sum is σ = 2226280288. Its totient is φ = 1080400464.

The previous prime is 1645155443. The next prime is 1645155497. The reversal of 1645155453 is 3545515461.

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

It is not a de Polignac number, because 1645155453 - 2⁹ = 1645154941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645155443) 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, 4092226 + ... + 4092627.

It is an arithmetic number, because the mean of its divisors is an integer number (278285036).

Almost surely, 2^1645155453 is an apocalyptic number.

It is an amenable number.

1645155453 is a deficient number, since it is larger than the sum of its proper divisors (581124835).

1645155453 is an equidigital number, since it uses as much as digits as its factorization.

1645155453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8184923.

The product of its digits is 180000, while the sum is 39.

The square root of 1645155453 is about 40560.5159360677. The cubic root of 1645155453 is about 1180.5081247901.

The spelling of 1645155453 in words is "one billion, six hundred forty-five million, one hundred fifty-five thousand, four hundred fifty-three".