77432381987 has 2 divisors, whose sum is σ = 77432381988. Its totient is φ = 77432381986.

The previous prime is 77432381911. The next prime is 77432381989. The reversal of 77432381987 is 78918323477.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77432381987 - 2⁸ = 77432381731 is a prime.

Together with 77432381989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77432381989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38716190993 + 38716190994.

It is an arithmetic number, because the mean of its divisors is an integer number (38716190994).

Almost surely, 2^77432381987 is an apocalyptic number.

77432381987 is a deficient number, since it is larger than the sum of its proper divisors (1).

77432381987 is an equidigital number, since it uses as much as digits as its factorization.

77432381987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 59.

The spelling of 77432381987 in words is "seventy-seven billion, four hundred thirty-two million, three hundred eighty-one thousand, nine hundred eighty-seven".