25661142 has 24 divisors (see below), whose sum is σ = 59876544. Its totient is φ = 7895664.

The previous prime is 25661137. The next prime is 25661147. The reversal of 25661142 is 24116652.

25661142 is a `hidden beast` number, since 2 + 5 + 6 + 611 + 42 = 666.

It is an interprime number because it is at equal distance from previous prime (25661137) and next prime (25661147).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25661147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54598 + ... + 55065.

It is an arithmetic number, because the mean of its divisors is an integer number (2494856).

Almost surely, 2^25661142 is an apocalyptic number.

25661142 is an abundant number, since it is smaller than the sum of its proper divisors (34215402).

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

25661142 is a wasteful number, since it uses less digits than its factorization.

25661142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109684 (or 109681 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 25661142 is about 5065.6827772769. The cubic root of 25661142 is about 294.9569677727.

Adding to 25661142 its reverse (24116652), we get a palindrome (49777794).

The spelling of 25661142 in words is "twenty-five million, six hundred sixty-one thousand, one hundred forty-two".