29896891518025 has 81 divisors (see below), whose sum is σ = 44671371056949. Its totient is φ = 19790129674560.

The previous prime is 29896891517953. The next prime is 29896891518041. The reversal of 29896891518025 is 52081519869892.

The square root of 29896891518025 is 5467805.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 410948948809 + 29485942569216 = 641053^2 + 5430096^2 .

It is not a de Polignac number, because 29896891518025 - 2⁷ = 29896891517897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 5549819382 + ... + 5549824768.

Almost surely, 2^{29896891518025} is an apocalyptic number.

29896891518025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

29896891518025 is the 5467805-th square number.

29896891518025 is the 2733903-rd centered octagonal number.

It is an amenable number.

29896891518025 is a deficient number, since it is larger than the sum of its proper divisors (14774479538924).

29896891518025 is an frugal number, since it uses more digits than its factorization.

29896891518025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10856 (or 5428 counting only the distinct ones).

The product of its (nonzero) digits is 223948800, while the sum is 73.

The spelling of 29896891518025 in words is "twenty-nine trillion, eight hundred ninety-six billion, eight hundred ninety-one million, five hundred eighteen thousand, twenty-five".