611451145661 has 4 divisors (see below), whose sum is σ = 611474908800. Its totient is φ = 611427382524.

The previous prime is 611451145651. The next prime is 611451145663. The reversal of 611451145661 is 166541154116.

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 611451145661 - 2³⁰ = 610377403837 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 (611451145663) 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, 11842931 + ... + 11894448.

It is an arithmetic number, because the mean of its divisors is an integer number (152868727200).

Almost surely, 2^611451145661 is an apocalyptic number.

It is an amenable number.

611451145661 is a deficient number, since it is larger than the sum of its proper divisors (23763139).

611451145661 is a wasteful number, since it uses less digits than its factorization.

611451145661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23763138.

The product of its digits is 86400, while the sum is 41.

Adding to 611451145661 its reverse (166541154116), we get a palindrome (777992299777).

The spelling of 611451145661 in words is "six hundred eleven billion, four hundred fifty-one million, one hundred forty-five thousand, six hundred sixty-one".