29666478138 has 16 divisors (see below), whose sum is σ = 64726861536. Its totient is φ = 8989841840.

The previous prime is 29666478091. The next prime is 29666478139. The reversal of 29666478138 is 83187466692.

It is a super-2 number, since 2×29666478138² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (29666478139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224745981 + ... + 224746112.

It is an arithmetic number, because the mean of its divisors is an integer number (4045428846).

Almost surely, 2^29666478138 is an apocalyptic number.

29666478138 is an abundant number, since it is smaller than the sum of its proper divisors (35060383398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29666478138 is a wasteful number, since it uses less digits than its factorization.

29666478138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449492109.

The product of its digits is 20901888, while the sum is 60.

The spelling of 29666478138 in words is "twenty-nine billion, six hundred sixty-six million, four hundred seventy-eight thousand, one hundred thirty-eight".