25491989470 has 8 divisors (see below), whose sum is σ = 45885581064. Its totient is φ = 10196795784.

The previous prime is 25491989443. The next prime is 25491989473. The reversal of 25491989470 is 7498919452.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25491989473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1274599464 + ... + 1274599483.

It is an arithmetic number, because the mean of its divisors is an integer number (5735697633).

Almost surely, 2^25491989470 is an apocalyptic number.

25491989470 is a deficient number, since it is larger than the sum of its proper divisors (20393591594).

25491989470 is a wasteful number, since it uses less digits than its factorization.

25491989470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549198954.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 25491989470 in words is "twenty-five billion, four hundred ninety-one million, nine hundred eighty-nine thousand, four hundred seventy".