42491540025 has 72 divisors (see below), whose sum is σ = 85051118880. Its totient is φ = 20099424000.

The previous prime is 42491540023. The next prime is 42491540083. The reversal of 42491540025 is 52004519424.

It is a happy number.

42491540025 is a `hidden beast` number, since 4 + 2 + 4 + 91 + 540 + 0 + 25 = 666.

42491540025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42491540025 - 2¹ = 42491540023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42491540023) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 107895 + ... + 310844.

It is an arithmetic number, because the mean of its divisors is an integer number (1181265540).

Almost surely, 2^42491540025 is an apocalyptic number.

42491540025 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42491540025 is an abundant number, since it is smaller than the sum of its proper divisors (42559578855).

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

42491540025 is a wasteful number, since it uses less digits than its factorization.

42491540025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418807 (or 418799 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 42491540025 in words is "forty-two billion, four hundred ninety-one million, five hundred forty thousand, twenty-five".