29997979796556 has 144 divisors (see below), whose sum is σ = 81580689066240. Its totient is φ = 9266248886400.

The previous prime is 29997979796531. The next prime is 29997979796563. The reversal of 29997979796556 is 65569797979992.

29997979796556 is a `hidden beast` number, since 299 + 9 + 7 + 97 + 97 + 96 + 5 + 56 = 666.

It is a super-2 number, since 2×29997979796556² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3118161 + ... + 8349783.

It is an arithmetic number, because the mean of its divisors is an integer number (566532562960).

Almost surely, 2^{29997979796556} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 29997979796556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40790344533120).

29997979796556 is an abundant number, since it is smaller than the sum of its proper divisors (51582709269684).

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

29997979796556 is a wasteful number, since it uses less digits than its factorization.

29997979796556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5231836 (or 5231831 counting only the distinct ones).

The product of its digits is 328111673400, while the sum is 99.

The spelling of 29997979796556 in words is "twenty-nine trillion, nine hundred ninety-seven billion, nine hundred seventy-nine million, seven hundred ninety-six thousand, five hundred fifty-six".