611660563261 has 8 divisors (see below), whose sum is σ = 706517014464. Its totient is φ = 523345936320.

The previous prime is 611660563253. The next prime is 611660563337. The reversal of 611660563261 is 162365066116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 611660563261 - 2³ = 611660563253 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 (611660563231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1635455865 + ... + 1635456238.

It is an arithmetic number, because the mean of its divisors is an integer number (88314626808).

Almost surely, 2^611660563261 is an apocalyptic number.

It is an amenable number.

611660563261 is a deficient number, since it is larger than the sum of its proper divisors (94856451203).

611660563261 is a wasteful number, since it uses less digits than its factorization.

611660563261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270912131.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 611660563261 in words is "six hundred eleven billion, six hundred sixty million, five hundred sixty-three thousand, two hundred sixty-one".