1366652661 has 32 divisors (see below), whose sum is σ = 2109017088. Its totient is φ = 777987840.

The previous prime is 1366652657. The next prime is 1366652669. The reversal of 1366652661 is 1662566631.

It is not a de Polignac number, because 1366652661 - 2² = 1366652657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366652669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313680 + ... + 318006.

It is an arithmetic number, because the mean of its divisors is an integer number (65906784).

Almost surely, 2^1366652661 is an apocalyptic number.

1366652661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1366652661 is a deficient number, since it is larger than the sum of its proper divisors (742364427).

1366652661 is a wasteful number, since it uses less digits than its factorization.

1366652661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4921.

The product of its digits is 233280, while the sum is 42.

The square root of 1366652661 is about 36968.2655936142. The cubic root of 1366652661 is about 1109.7352562350.

The spelling of 1366652661 in words is "one billion, three hundred sixty-six million, six hundred fifty-two thousand, six hundred sixty-one".