1401666611 has 2 divisors, whose sum is σ = 1401666612. Its totient is φ = 1401666610.

The previous prime is 1401666559. The next prime is 1401666647. The reversal of 1401666611 is 1166661041.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1401666611 is a prime.

It is not a weakly prime, because it can be changed into another prime (1401666311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700833305 + 700833306.

It is an arithmetic number, because the mean of its divisors is an integer number (700833306).

Almost surely, 2^1401666611 is an apocalyptic number.

1401666611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401666611 is an equidigital number, since it uses as much as digits as its factorization.

1401666611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1401666611 is about 37438.8382699036. The cubic root of 1401666611 is about 1119.1326754055.

The spelling of 1401666611 in words is "one billion, four hundred one million, six hundred sixty-six thousand, six hundred eleven".