603615991681 has 4 divisors (see below), whose sum is σ = 604774564164. Its totient is φ = 602457419200.

The previous prime is 603615991613. The next prime is 603615991691. The reversal of 603615991681 is 186199516306.

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

It can be written as a sum of positive squares in 2 ways, for example, as 160048003600 + 443567988081 = 400060^2 + 666009^2 .

It is a cyclic number.

It is not a de Polignac number, because 603615991681 - 2³¹ = 601468508033 is a prime.

It is a super-2 number, since 2×603615991681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (603615991691) 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, 579285460 + ... + 579286501.

It is an arithmetic number, because the mean of its divisors is an integer number (151193641041).

Almost surely, 2^603615991681 is an apocalyptic number.

It is an amenable number.

603615991681 is a deficient number, since it is larger than the sum of its proper divisors (1158572483).

603615991681 is a wasteful number, since it uses less digits than its factorization.

603615991681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158572482.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 603615991681 in words is "six hundred three billion, six hundred fifteen million, nine hundred ninety-one thousand, six hundred eighty-one".