611231540560 has 20 divisors (see below), whose sum is σ = 1421113331988. Its totient is φ = 244492616192.

The previous prime is 611231540509. The next prime is 611231540561. The reversal of 611231540560 is 65045132116.

It can be written as a sum of positive squares in 2 ways, for example, as 422364810816 + 188866729744 = 649896^2 + 434588^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×611231540560² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611231540561) 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, 3820197049 + ... + 3820197208.

Almost surely, 2^611231540560 is an apocalyptic number.

It is an amenable number.

611231540560 is an abundant number, since it is smaller than the sum of its proper divisors (809881791428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

611231540560 is a wasteful number, since it uses less digits than its factorization.

611231540560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7640394270 (or 7640394264 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 611231540560 its reverse (65045132116), we get a palindrome (676276672676).

The spelling of 611231540560 in words is "six hundred eleven billion, two hundred thirty-one million, five hundred forty thousand, five hundred sixty".