1166365701661 has 4 divisors (see below), whose sum is σ = 1166937732000. Its totient is φ = 1165793671324.

The previous prime is 1166365701659. The next prime is 1166365701689. The reversal of 1166365701661 is 1661075636611.

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 1166365701661 - 2¹ = 1166365701659 is a prime.

It is a super-2 number, since 2×1166365701661² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166365702661) 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, 286012111 + ... + 286016188.

It is an arithmetic number, because the mean of its divisors is an integer number (291734433000).

Almost surely, 2^{1166365701661} is an apocalyptic number.

It is an amenable number.

1166365701661 is a deficient number, since it is larger than the sum of its proper divisors (572030339).

1166365701661 is an equidigital number, since it uses as much as digits as its factorization.

1166365701661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572030338.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 1166365701661 in words is "one trillion, one hundred sixty-six billion, three hundred sixty-five million, seven hundred one thousand, six hundred sixty-one".