29661037216631 has 4 divisors (see below), whose sum is σ = 29661080747832. Its totient is φ = 29660993685432.

The previous prime is 29661037216627. The next prime is 29661037216661. The reversal of 29661037216631 is 13661273016692.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 29661037216631 - 2² = 29661037216627 is a prime.

It is a super-2 number, since 2×29661037216631² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29661037216661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20727020 + ... + 22111793.

It is an arithmetic number, because the mean of its divisors is an integer number (7415270186958).

Almost surely, 2^{29661037216631} is an apocalyptic number.

29661037216631 is a deficient number, since it is larger than the sum of its proper divisors (43531201).

29661037216631 is an equidigital number, since it uses as much as digits as its factorization.

29661037216631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43531200.

The product of its (nonzero) digits is 2939328, while the sum is 53.

The spelling of 29661037216631 in words is "twenty-nine trillion, six hundred sixty-one billion, thirty-seven million, two hundred sixteen thousand, six hundred thirty-one".