761847860821 has 2 divisors, whose sum is σ = 761847860822. Its totient is φ = 761847860820.

The previous prime is 761847860783. The next prime is 761847860861. The reversal of 761847860821 is 128068748167.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393993480721 + 367854380100 = 627689^2 + 606510^2 .

It is a cyclic number.

It is not a de Polignac number, because 761847860821 - 2⁷ = 761847860693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (761847860861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380923930410 + 380923930411.

It is an arithmetic number, because the mean of its divisors is an integer number (380923930411).

Almost surely, 2^761847860821 is an apocalyptic number.

It is an amenable number.

761847860821 is a deficient number, since it is larger than the sum of its proper divisors (1).

761847860821 is an equidigital number, since it uses as much as digits as its factorization.

761847860821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7225344, while the sum is 58.

The spelling of 761847860821 in words is "seven hundred sixty-one billion, eight hundred forty-seven million, eight hundred sixty thousand, eight hundred twenty-one".