29993239861657 has 4 divisors (see below), whose sum is σ = 30559150047780. Its totient is φ = 29427329675536.

The previous prime is 29993239861639. The next prime is 29993239861693. The reversal of 29993239861657 is 75616893239992.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10614896318601 + 19378343543056 = 3258051^2 + 4402084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29993239861657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29993239861157) 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, 282955092982 + ... + 282955093087.

It is an arithmetic number, because the mean of its divisors is an integer number (7639787511945).

Almost surely, 2^{29993239861657} is an apocalyptic number.

It is an amenable number.

29993239861657 is a deficient number, since it is larger than the sum of its proper divisors (565910186123).

29993239861657 is an equidigital number, since it uses as much as digits as its factorization.

29993239861657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565910186122.

The product of its digits is 2380855680, while the sum is 79.

The spelling of 29993239861657 in words is "twenty-nine trillion, nine hundred ninety-three billion, two hundred thirty-nine million, eight hundred sixty-one thousand, six hundred fifty-seven".