761561663729 has 2 divisors, whose sum is σ = 761561663730. Its totient is φ = 761561663728.

The previous prime is 761561663699. The next prime is 761561663743. The reversal of 761561663729 is 927366165167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 712918479025 + 48643184704 = 844345^2 + 220552^2 .

It is a cyclic number.

It is not a de Polignac number, because 761561663729 - 2²⁴ = 761544886513 is a prime.

It is not a weakly prime, because it can be changed into another prime (761561665729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380780831864 + 380780831865.

It is an arithmetic number, because the mean of its divisors is an integer number (380780831865).

Almost surely, 2^761561663729 is an apocalyptic number.

It is an amenable number.

761561663729 is a deficient number, since it is larger than the sum of its proper divisors (1).

761561663729 is an equidigital number, since it uses as much as digits as its factorization.

761561663729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 59.

The spelling of 761561663729 in words is "seven hundred sixty-one billion, five hundred sixty-one million, six hundred sixty-three thousand, seven hundred twenty-nine".