1620737603 has 4 divisors (see below), whose sum is σ = 1664541360. Its totient is φ = 1576933848.

The previous prime is 1620737581. The next prime is 1620737617. The reversal of 1620737603 is 3067370261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3067370261 = 587 ⋅5225503.

It is a cyclic number.

It is not a de Polignac number, because 1620737603 - 2¹² = 1620733507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620737683) 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, 21901823 + ... + 21901896.

It is an arithmetic number, because the mean of its divisors is an integer number (416135340).

Almost surely, 2^1620737603 is an apocalyptic number.

1620737603 is a deficient number, since it is larger than the sum of its proper divisors (43803757).

1620737603 is an equidigital number, since it uses as much as digits as its factorization.

1620737603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43803756.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 1620737603 is about 40258.3854991727. The cubic root of 1620737603 is about 1174.6385133367.

The spelling of 1620737603 in words is "one billion, six hundred twenty million, seven hundred thirty-seven thousand, six hundred three".