61111161660650 has 48 divisors (see below), whose sum is σ = 117112668874200. Its totient is φ = 23713773557760.

The previous prime is 61111161660589. The next prime is 61111161660691. The reversal of 61111161660650 is 5606616111116.

It can be written as a sum of positive squares in 12 ways, for example, as 15724909201 + 61095436751449 = 125399^2 + 7816357^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61111161660598 and 61111161660607.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129319295 + ... + 129790994.

Almost surely, 2^{61111161660650} is an apocalyptic number.

61111161660650 is a deficient number, since it is larger than the sum of its proper divisors (56001507213550).

61111161660650 is a wasteful number, since it uses less digits than its factorization.

61111161660650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259110443 (or 259110438 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

Adding to 61111161660650 its reverse (5606616111116), we get a palindrome (66717777771766).

The spelling of 61111161660650 in words is "sixty-one trillion, one hundred eleven billion, one hundred sixty-one million, six hundred sixty thousand, six hundred fifty".