29561781225 has 48 divisors (see below), whose sum is σ = 49363054848. Its totient is φ = 15609623040.

The previous prime is 29561781217. The next prime is 29561781239. The reversal of 29561781225 is 52218716592.

It is not a de Polignac number, because 29561781225 - 2³ = 29561781217 is a prime.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 4075552 + ... + 4082798.

It is an arithmetic number, because the mean of its divisors is an integer number (1028396976).

Almost surely, 2^29561781225 is an apocalyptic number.

29561781225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

29561781225 is a deficient number, since it is larger than the sum of its proper divisors (19801273623).

29561781225 is a wasteful number, since it uses less digits than its factorization.

29561781225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7794 (or 7789 counting only the distinct ones).

The product of its digits is 604800, while the sum is 48.

The spelling of 29561781225 in words is "twenty-nine billion, five hundred sixty-one million, seven hundred eighty-one thousand, two hundred twenty-five".