29927747691 has 6 divisors (see below), whose sum is σ = 43228968900. Its totient is φ = 19951831788.

The previous prime is 29927747687. The next prime is 29927747693. The reversal of 29927747691 is 19674772992.

29927747691 is a `hidden beast` number, since 2 + 9 + 9 + 2 + 77 + 476 + 91 = 666.

It is not a de Polignac number, because 29927747691 - 2² = 29927747687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29927747693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1662652641 + ... + 1662652658.

It is an arithmetic number, because the mean of its divisors is an integer number (7204828150).

Almost surely, 2^29927747691 is an apocalyptic number.

29927747691 is a deficient number, since it is larger than the sum of its proper divisors (13301221209).

29927747691 is a wasteful number, since it uses less digits than its factorization.

29927747691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325305305 (or 3325305302 counting only the distinct ones).

The product of its digits is 24004512, while the sum is 63.

The spelling of 29927747691 in words is "twenty-nine billion, nine hundred twenty-seven million, seven hundred forty-seven thousand, six hundred ninety-one".