29998399928561 has 4 divisors (see below), whose sum is σ = 29998424034624. Its totient is φ = 29998375822500.

The previous prime is 29998399928557. The next prime is 29998399928573. The reversal of 29998399928561 is 16582999389992.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 29998399928561 - 2² = 29998399928557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29998399928461) 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, 10078565 + ... + 12711186.

It is an arithmetic number, because the mean of its divisors is an integer number (7499606008656).

Almost surely, 2^{29998399928561} is an apocalyptic number.

It is an amenable number.

29998399928561 is a deficient number, since it is larger than the sum of its proper divisors (24106063).

29998399928561 is a wasteful number, since it uses less digits than its factorization.

29998399928561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24106062.

The product of its digits is 12244400640, while the sum is 89.

The spelling of 29998399928561 in words is "twenty-nine trillion, nine hundred ninety-eight billion, three hundred ninety-nine million, nine hundred twenty-eight thousand, five hundred sixty-one".