29991677956 has 6 divisors (see below), whose sum is σ = 52485436430. Its totient is φ = 14995838976.

The previous prime is 29991677951. The next prime is 29991677957. The reversal of 29991677956 is 65977619992.

It can be written as a sum of positive squares in only one way, i.e., 22519804356 + 7471873600 = 150066^2 + 86440^2 .

It is not an unprimeable number, because it can be changed into a prime (29991677951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3748959741 + ... + 3748959748.

Almost surely, 2^29991677956 is an apocalyptic number.

It is an amenable number.

29991677956 is a deficient number, since it is larger than the sum of its proper divisors (22493758474).

29991677956 is a wasteful number, since it uses less digits than its factorization.

29991677956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7497919493 (or 7497919491 counting only the distinct ones).

The product of its digits is 115736040, while the sum is 70.

The spelling of 29991677956 in words is "twenty-nine billion, nine hundred ninety-one million, six hundred seventy-seven thousand, nine hundred fifty-six".