1642655603 has 4 divisors (see below), whose sum is σ = 1643086008. Its totient is φ = 1642225200.

The previous prime is 1642655579. The next prime is 1642655629. The reversal of 1642655603 is 3065562461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1642655603 - 2¹⁰ = 1642654579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642655633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209426 + ... + 217127.

It is an arithmetic number, because the mean of its divisors is an integer number (410771502).

Almost surely, 2^1642655603 is an apocalyptic number.

1642655603 is a deficient number, since it is larger than the sum of its proper divisors (430405).

1642655603 is an equidigital number, since it uses as much as digits as its factorization.

1642655603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430404.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 1642655603 is about 40529.6879213250. The cubic root of 1642655603 is about 1179.9098856300.

The spelling of 1642655603 in words is "one billion, six hundred forty-two million, six hundred fifty-five thousand, six hundred three".