761544661 has 2 divisors, whose sum is σ = 761544662. Its totient is φ = 761544660.

The previous prime is 761544659. The next prime is 761544689. The reversal of 761544661 is 166445167.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499299025 + 262245636 = 22345^2 + 16194^2 .

It is a cyclic number.

It is not a de Polignac number, because 761544661 - 2¹ = 761544659 is a prime.

Together with 761544659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (761544691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380772330 + 380772331.

It is an arithmetic number, because the mean of its divisors is an integer number (380772331).

Almost surely, 2^761544661 is an apocalyptic number.

It is an amenable number.

761544661 is a deficient number, since it is larger than the sum of its proper divisors (1).

761544661 is an equidigital number, since it uses as much as digits as its factorization.

761544661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 761544661 is about 27596.0986554259. The cubic root of 761544661 is about 913.1983663879.

The spelling of 761544661 in words is "seven hundred sixty-one million, five hundred forty-four thousand, six hundred sixty-one".