1620345453 has 4 divisors (see below), whose sum is σ = 2160460608. Its totient is φ = 1080230300.

The previous prime is 1620345439. The next prime is 1620345547. The reversal of 1620345453 is 3545430261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1620345453 - 2⁹ = 1620344941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620345413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270057573 + ... + 270057578.

It is an arithmetic number, because the mean of its divisors is an integer number (540115152).

Almost surely, 2^1620345453 is an apocalyptic number.

It is an amenable number.

1620345453 is a deficient number, since it is larger than the sum of its proper divisors (540115155).

1620345453 is an equidigital number, since it uses as much as digits as its factorization.

1620345453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540115154.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 1620345453 is about 40253.5147906366. The cubic root of 1620345453 is about 1174.5437680700.

The spelling of 1620345453 in words is "one billion, six hundred twenty million, three hundred forty-five thousand, four hundred fifty-three".