29991677987 has 2 divisors, whose sum is σ = 29991677988. Its totient is φ = 29991677986.

The previous prime is 29991677959. The next prime is 29991677993. The reversal of 29991677987 is 78977619992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 29991677987 - 2¹² = 29991673891 is a prime.

It is not a weakly prime, because it can be changed into another prime (29991677957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14995838993 + 14995838994.

It is an arithmetic number, because the mean of its divisors is an integer number (14995838994).

Almost surely, 2^29991677987 is an apocalyptic number.

29991677987 is a deficient number, since it is larger than the sum of its proper divisors (1).

29991677987 is an equidigital number, since it uses as much as digits as its factorization.

29991677987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216040608, while the sum is 74.

The spelling of 29991677987 in words is "twenty-nine billion, nine hundred ninety-one million, six hundred seventy-seven thousand, nine hundred eighty-seven".