1365120661 has 8 divisors (see below), whose sum is σ = 1404187704. Its totient is φ = 1326168000.

The previous prime is 1365120637. The next prime is 1365120667. The reversal of 1365120661 is 1660215631.

It can be written as a sum of positive squares in 4 ways, for example, as 114083761 + 1251036900 = 10681^2 + 35370^2 .

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 1365120661 - 2⁹ = 1365120149 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 (1365120667) 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, 4090 + ... + 52411.

It is an arithmetic number, because the mean of its divisors is an integer number (175523463).

Almost surely, 2^1365120661 is an apocalyptic number.

It is an amenable number.

1365120661 is a deficient number, since it is larger than the sum of its proper divisors (39067043).

1365120661 is an equidigital number, since it uses as much as digits as its factorization.

1365120661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57191.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1365120661 is about 36947.5393091340. The cubic root of 1365120661 is about 1109.3204348918.

The spelling of 1365120661 in words is "one billion, three hundred sixty-five million, one hundred twenty thousand, six hundred sixty-one".