25491067019 has 8 divisors (see below), whose sum is σ = 28767348720. Its totient is φ = 22374604000.

The previous prime is 25491066989. The next prime is 25491067057. The reversal of 25491067019 is 91076019452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25491067019 is a prime.

It is a super-2 number, since 2×25491067019² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25491067099) 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 7 ways as a sum of consecutive naturals, for example, 39954332 + ... + 39954969.

It is an arithmetic number, because the mean of its divisors is an integer number (3595918590).

Almost surely, 2^25491067019 is an apocalyptic number.

25491067019 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

25491067019 is a deficient number, since it is larger than the sum of its proper divisors (3276281701).

25491067019 is a wasteful number, since it uses less digits than its factorization.

25491067019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79909341.

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 25491067019 in words is "twenty-five billion, four hundred ninety-one million, sixty-seven thousand, nineteen".