1645154553 has 16 divisors (see below), whose sum is σ = 2511712256. Its totient is φ = 938284560.

The previous prime is 1645154509. The next prime is 1645154573. The reversal of 1645154553 is 3554515461.

It is not a de Polignac number, because 1645154553 - 2⁹ = 1645154041 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1645154573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63913 + ... + 85878.

It is an arithmetic number, because the mean of its divisors is an integer number (156982016).

Almost surely, 2^1645154553 is an apocalyptic number.

It is an amenable number.

1645154553 is a deficient number, since it is larger than the sum of its proper divisors (866557703).

1645154553 is a wasteful number, since it uses less digits than its factorization.

1645154553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150324.

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

The square root of 1645154553 is about 40560.5048415327. The cubic root of 1645154553 is about 1180.5079095202.

The spelling of 1645154553 in words is "one billion, six hundred forty-five million, one hundred fifty-four thousand, five hundred fifty-three".