29685317985 has 12 divisors (see below), whose sum is σ = 51454551252. Its totient is φ = 15832169568.

The previous prime is 29685317927. The next prime is 29685318031. The reversal of 29685317985 is 58971358692.

29685317985 is a `hidden beast` number, since 2 + 9 + 6 + 8 + 531 + 7 + 98 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19858164561 + 9827153424 = 140919^2 + 99132^2 .

It is not a de Polignac number, because 29685317985 - 2¹³ = 29685309793 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329836822 + ... + 329836911.

It is an arithmetic number, because the mean of its divisors is an integer number (4287879271).

Almost surely, 2^29685317985 is an apocalyptic number.

It is an amenable number.

29685317985 is a deficient number, since it is larger than the sum of its proper divisors (21769233267).

29685317985 is a wasteful number, since it uses less digits than its factorization.

29685317985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659673744 (or 659673741 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 63.

The spelling of 29685317985 in words is "twenty-nine billion, six hundred eighty-five million, three hundred seventeen thousand, nine hundred eighty-five".