612361661 has 4 divisors (see below), whose sum is σ = 612753024. Its totient is φ = 611970300.

The previous prime is 612361597. The next prime is 612361681. The reversal of 612361661 is 166163216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 612361661 - 2⁶ = 612361597 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 (612361681) 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, 193325 + ... + 196466.

It is an arithmetic number, because the mean of its divisors is an integer number (153188256).

Almost surely, 2^612361661 is an apocalyptic number.

It is an amenable number.

612361661 is a deficient number, since it is larger than the sum of its proper divisors (391363).

612361661 is a wasteful number, since it uses less digits than its factorization.

612361661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391362.

The product of its digits is 7776, while the sum is 32.

The square root of 612361661 is about 24745.9423138421. The cubic root of 612361661 is about 849.1856842487.

The spelling of 612361661 in words is "six hundred twelve million, three hundred sixty-one thousand, six hundred sixty-one".