87798691601 has 2 divisors, whose sum is σ = 87798691602. Its totient is φ = 87798691600.

The previous prime is 87798691559. The next prime is 87798691609. The reversal of 87798691601 is 10619689778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59596527376 + 28202164225 = 244124^2 + 167935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87798691601 is a prime.

It is a super-2 number, since 2×87798691601² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87798691609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43899345800 + 43899345801.

It is an arithmetic number, because the mean of its divisors is an integer number (43899345801).

Almost surely, 2^87798691601 is an apocalyptic number.

It is an amenable number.

87798691601 is a deficient number, since it is larger than the sum of its proper divisors (1).

87798691601 is an equidigital number, since it uses as much as digits as its factorization.

87798691601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9144576, while the sum is 62.

The spelling of 87798691601 in words is "eighty-seven billion, seven hundred ninety-eight million, six hundred ninety-one thousand, six hundred one".