612003661 has 12 divisors (see below), whose sum is σ = 655576032. Its totient is φ = 571116744.

The previous prime is 612003641. The next prime is 612003671. The reversal of 612003661 is 166300216.

It is not a de Polignac number, because 612003661 - 2⁵ = 612003629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612003641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11536 + ... + 36838.

It is an arithmetic number, because the mean of its divisors is an integer number (54631336).

Almost surely, 2^612003661 is an apocalyptic number.

It is an amenable number.

612003661 is a deficient number, since it is larger than the sum of its proper divisors (43572371).

612003661 is a wasteful number, since it uses less digits than its factorization.

612003661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25408 (or 25389 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 612003661 is about 24738.7077471722. The cubic root of 612003661 is about 849.0201678244.

Adding to 612003661 its reverse (166300216), we get a palindrome (778303877).

The spelling of 612003661 in words is "six hundred twelve million, three thousand, six hundred sixty-one".