25663428478 has 8 divisors (see below), whose sum is σ = 40521202920. Its totient is φ = 12156360840.

The previous prime is 25663428473. The next prime is 25663428491. The reversal of 25663428478 is 87482436652.

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

It is a super-2 number, since 2×25663428478² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25663428473) 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, 337676653 + ... + 337676728.

It is an arithmetic number, because the mean of its divisors is an integer number (5065150365).

Almost surely, 2^25663428478 is an apocalyptic number.

25663428478 is a deficient number, since it is larger than the sum of its proper divisors (14857774442).

25663428478 is a wasteful number, since it uses less digits than its factorization.

25663428478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675353402.

The product of its digits is 15482880, while the sum is 55.

The spelling of 25663428478 in words is "twenty-five billion, six hundred sixty-three million, four hundred twenty-eight thousand, four hundred seventy-eight".