25422001040 has 20 divisors (see below), whose sum is σ = 59106152604. Its totient is φ = 10168800384.

The previous prime is 25422001037. The next prime is 25422001049. The reversal of 25422001040 is 4010022452.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13153337344 + 12268663696 = 114688^2 + 110764^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×25422001040² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (25422001049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158887427 + ... + 158887586.

Almost surely, 2^25422001040 is an apocalyptic number.

25422001040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25422001040 is an abundant number, since it is smaller than the sum of its proper divisors (33684151564).

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

25422001040 is a wasteful number, since it uses less digits than its factorization.

25422001040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317775026 (or 317775020 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 25422001040 its reverse (4010022452), we get a palindrome (29432023492).

The spelling of 25422001040 in words is "twenty-five billion, four hundred twenty-two million, one thousand, forty".