25405203142 has 32 divisors (see below), whose sum is σ = 43035162624. Its totient is φ = 11143545600.

The previous prime is 25405203137. The next prime is 25405203151. The reversal of 25405203142 is 24130250452.

It is a self number, because there is not a number n which added to its sum of digits gives 25405203142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187983 + ... + 293509.

It is an arithmetic number, because the mean of its divisors is an integer number (1344848832).

Almost surely, 2^25405203142 is an apocalyptic number.

25405203142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25405203142 is a deficient number, since it is larger than the sum of its proper divisors (17629959482).

25405203142 is a wasteful number, since it uses less digits than its factorization.

25405203142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105924.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 25405203142 its reverse (24130250452), we get a palindrome (49535453594).

The spelling of 25405203142 in words is "twenty-five billion, four hundred five million, two hundred three thousand, one hundred forty-two".