137766661 has 2 divisors, whose sum is σ = 137766662. Its totient is φ = 137766660.

The previous prime is 137766641. The next prime is 137766667. The reversal of 137766661 is 166667731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85840225 + 51926436 = 9265^2 + 7206^2 .

It is a cyclic number.

It is not a de Polignac number, because 137766661 - 2⁷ = 137766533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137766667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68883330 + 68883331.

It is an arithmetic number, because the mean of its divisors is an integer number (68883331).

Almost surely, 2^137766661 is an apocalyptic number.

It is an amenable number.

137766661 is a deficient number, since it is larger than the sum of its proper divisors (1).

137766661 is an equidigital number, since it uses as much as digits as its factorization.

137766661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 43.

The square root of 137766661 is about 11737.4043553079. The cubic root of 137766661 is about 516.4735014755.

The spelling of 137766661 in words is "one hundred thirty-seven million, seven hundred sixty-six thousand, six hundred sixty-one".