87776181887 has 2 divisors, whose sum is σ = 87776181888. Its totient is φ = 87776181886.

The previous prime is 87776181863. The next prime is 87776181907. The reversal of 87776181887 is 78818167778.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87776181887 - 2³⁰ = 86702440063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87776180887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43888090943 + 43888090944.

It is an arithmetic number, because the mean of its divisors is an integer number (43888090944).

Almost surely, 2^87776181887 is an apocalyptic number.

87776181887 is a deficient number, since it is larger than the sum of its proper divisors (1).

87776181887 is an equidigital number, since it uses as much as digits as its factorization.

87776181887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 59006976, while the sum is 68.

The spelling of 87776181887 in words is "eighty-seven billion, seven hundred seventy-six million, one hundred eighty-one thousand, eight hundred eighty-seven".