727756661 has 2 divisors, whose sum is σ = 727756662. Its totient is φ = 727756660.

The previous prime is 727756643. The next prime is 727756693. The reversal of 727756661 is 166657727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 569776900 + 157979761 = 23870^2 + 12569^2 .

It is a cyclic number.

It is not a de Polignac number, because 727756661 - 2⁶ = 727756597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (727756061) 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, 363878330 + 363878331.

It is an arithmetic number, because the mean of its divisors is an integer number (363878331).

Almost surely, 2^727756661 is an apocalyptic number.

It is an amenable number.

727756661 is a deficient number, since it is larger than the sum of its proper divisors (1).

727756661 is an equidigital number, since it uses as much as digits as its factorization.

727756661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740880, while the sum is 47.

The square root of 727756661 is about 26976.9653778923. The cubic root of 727756661 is about 899.4880466973.

The spelling of 727756661 in words is "seven hundred twenty-seven million, seven hundred fifty-six thousand, six hundred sixty-one".