612441343411661 has 4 divisors (see below), whose sum is σ = 614605447098912. Its totient is φ = 610277239724412.

The previous prime is 612441343411649. The next prime is 612441343411673. The reversal of 612441343411661 is 166114343144216.

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 an interprime number because it is at equal distance from previous prime (612441343411649) and next prime (612441343411673).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612441343411661 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 (612441343411061) 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, 1082051843201 + ... + 1082051843766.

It is an arithmetic number, because the mean of its divisors is an integer number (153651361774728).

Almost surely, 2^{612441343411661} is an apocalyptic number.

It is an amenable number.

612441343411661 is a deficient number, since it is larger than the sum of its proper divisors (2164103687251).

612441343411661 is a wasteful number, since it uses less digits than its factorization.

612441343411661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164103687250.

The product of its digits is 995328, while the sum is 47.

Adding to 612441343411661 its reverse (166114343144216), we get a palindrome (778555686555877).

The spelling of 612441343411661 in words is "six hundred twelve trillion, four hundred forty-one billion, three hundred forty-three million, four hundred eleven thousand, six hundred sixty-one".