7561708421 has 2 divisors, whose sum is σ = 7561708422. Its totient is φ = 7561708420.

The previous prime is 7561708403. The next prime is 7561708423. The reversal of 7561708421 is 1248071657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4278991396 + 3282717025 = 65414^2 + 57295^2 .

It is a cyclic number.

It is not a de Polignac number, because 7561708421 - 2¹⁰ = 7561707397 is a prime.

It is a Sophie Germain prime.

Together with 7561708423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7561708423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3780854210 + 3780854211.

It is an arithmetic number, because the mean of its divisors is an integer number (3780854211).

Almost surely, 2^7561708421 is an apocalyptic number.

It is an amenable number.

7561708421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7561708421 is an equidigital number, since it uses as much as digits as its factorization.

7561708421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 7561708421 is about 86958.0842762765. The cubic root of 7561708421 is about 1962.7876151469.

The spelling of 7561708421 in words is "seven billion, five hundred sixty-one million, seven hundred eight thousand, four hundred twenty-one".