25344849978 has 48 divisors (see below), whose sum is σ = 63642623616. Its totient is φ = 7139391840.

The previous prime is 25344849967. The next prime is 25344849983. The reversal of 25344849978 is 87994844352.

25344849978 is a `hidden beast` number, since 2 + 5 + 34 + 48 + 499 + 78 = 666.

It is a super-2 number, since 2×25344849978² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 1407601 + ... + 1425492.

It is an arithmetic number, because the mean of its divisors is an integer number (1325887992).

Almost surely, 2^25344849978 is an apocalyptic number.

25344849978 is an abundant number, since it is smaller than the sum of its proper divisors (38297773638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25344849978 is a wasteful number, since it uses less digits than its factorization.

25344849978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833179 (or 2833176 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 25344849978 in words is "twenty-five billion, three hundred forty-four million, eight hundred forty-nine thousand, nine hundred seventy-eight".