87719824681 has 2 divisors, whose sum is σ = 87719824682. Its totient is φ = 87719824680.

The previous prime is 87719824613. The next prime is 87719824727. The reversal of 87719824681 is 18642891778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85196269456 + 2523555225 = 291884^2 + 50235^2 .

It is a cyclic number.

It is not a de Polignac number, because 87719824681 - 2¹⁹ = 87719300393 is a prime.

It is a super-2 number, since 2×87719824681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87719824601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43859912340 + 43859912341.

It is an arithmetic number, because the mean of its divisors is an integer number (43859912341).

Almost surely, 2^87719824681 is an apocalyptic number.

It is an amenable number.

87719824681 is a deficient number, since it is larger than the sum of its proper divisors (1).

87719824681 is an equidigital number, since it uses as much as digits as its factorization.

87719824681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10838016, while the sum is 61.

The spelling of 87719824681 in words is "eighty-seven billion, seven hundred nineteen million, eight hundred twenty-four thousand, six hundred eighty-one".