1180611661 has 8 divisors (see below), whose sum is σ = 1184181120. Its totient is φ = 1177048992.

The previous prime is 1180611599. The next prime is 1180611673. The reversal of 1180611661 is 1661160811.

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 1180611661 - 2²¹ = 1178514509 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 (1180612661) 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, 684346 + ... + 686068.

It is an arithmetic number, because the mean of its divisors is an integer number (148022640).

Almost surely, 2^1180611661 is an apocalyptic number.

It is an amenable number.

1180611661 is a deficient number, since it is larger than the sum of its proper divisors (3569459).

1180611661 is an equidigital number, since it uses as much as digits as its factorization.

1180611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3395.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 1180611661 is about 34360.0299912558. The cubic root of 1180611661 is about 1056.9043600235.

The spelling of 1180611661 in words is "one billion, one hundred eighty million, six hundred eleven thousand, six hundred sixty-one".