29987791945 has 4 divisors (see below), whose sum is σ = 35985350340. Its totient is φ = 23990233552.

The previous prime is 29987791901. The next prime is 29987791949. The reversal of 29987791945 is 54919778992.

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 19350757449 + 10637034496 = 139107^2 + 103136^2 .

It is a cyclic number.

It is not a de Polignac number, because 29987791945 - 2⁷ = 29987791817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29987791949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2998779190 + ... + 2998779199.

It is an arithmetic number, because the mean of its divisors is an integer number (8996337585).

Almost surely, 2^29987791945 is an apocalyptic number.

It is an amenable number.

29987791945 is a deficient number, since it is larger than the sum of its proper divisors (5997558395).

29987791945 is an equidigital number, since it uses as much as digits as its factorization.

29987791945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5997558394.

The product of its digits is 102876480, while the sum is 70.

The spelling of 29987791945 in words is "twenty-nine billion, nine hundred eighty-seven million, seven hundred ninety-one thousand, nine hundred forty-five".