29491979725 has 24 divisors (see below), whose sum is σ = 39670664040. Its totient is φ = 21619691520.

The previous prime is 29491979707. The next prime is 29491979767. The reversal of 29491979725 is 52797919492.

It can be written as a sum of positive squares in 12 ways, for example, as 3677452164 + 25814527561 = 60642^2 + 160669^2 .

It is not a de Polignac number, because 29491979725 - 2⁹ = 29491979213 is a prime.

It is a super-2 number, since 2×29491979725² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 286660 + ... + 375709.

It is an arithmetic number, because the mean of its divisors is an integer number (1652944335).

Almost surely, 2^29491979725 is an apocalyptic number.

29491979725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

29491979725 is a deficient number, since it is larger than the sum of its proper divisors (10178684315).

29491979725 is a wasteful number, since it uses less digits than its factorization.

29491979725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662529 (or 662524 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 64.

The spelling of 29491979725 in words is "twenty-nine billion, four hundred ninety-one million, nine hundred seventy-nine thousand, seven hundred twenty-five".