201625042440 has 64 divisors (see below), whose sum is σ = 617744828160. Its totient is φ = 52622704640.

The previous prime is 201625042373. The next prime is 201625042447. The reversal of 201625042440 is 44240526102.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 201625042398 and 201625042407.

It is not an unprimeable number, because it can be changed into a prime (201625042447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17868921 + ... + 17880200.

It is an arithmetic number, because the mean of its divisors is an integer number (9652262940).

Almost surely, 2^201625042440 is an apocalyptic number.

201625042440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201625042440 is an abundant number, since it is smaller than the sum of its proper divisors (416119785720).

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

201625042440 is a wasteful number, since it uses less digits than its factorization.

201625042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35749182 (or 35749178 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 201625042440 its reverse (44240526102), we get a palindrome (245865568542).

The spelling of 201625042440 in words is "two hundred one billion, six hundred twenty-five million, forty-two thousand, four hundred forty".