25419742640 has 40 divisors (see below), whose sum is σ = 59245478880. Its totient is φ = 10143023616.

The previous prime is 25419742637. The next prime is 25419742657. The reversal of 25419742640 is 4624791452.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 25419742591 and 25419742600.

It is an unprimeable number.

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, 355724 + ... + 421163.

It is an arithmetic number, because the mean of its divisors is an integer number (1481136972).

Almost surely, 2^25419742640 is an apocalyptic number.

25419742640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25419742640 is an abundant number, since it is smaller than the sum of its proper divisors (33825736240).

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

25419742640 is a wasteful number, since it uses less digits than its factorization.

25419742640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777309 (or 777303 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 25419742640 in words is "twenty-five billion, four hundred nineteen million, seven hundred forty-two thousand, six hundred forty".