25305220221534 has 48 divisors (see below), whose sum is σ = 59827267543680. Its totient is φ = 7666334598480.

The previous prime is 25305220221509. The next prime is 25305220221557. The reversal of 25305220221534 is 43512202250352.

It is a happy number.

25305220221534 is a `hidden beast` number, since 2 + 5 + 30 + 52 + 20 + 2 + 21 + 534 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15154224 + ... + 16740995.

It is an arithmetic number, because the mean of its divisors is an integer number (1246401407160).

Almost surely, 2^{25305220221534} is an apocalyptic number.

25305220221534 is an abundant number, since it is smaller than the sum of its proper divisors (34522047322146).

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

25305220221534 is a wasteful number, since it uses less digits than its factorization.

25305220221534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31899245 (or 31899242 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 25305220221534 its reverse (43512202250352), we get a palindrome (68817422471886).

The spelling of 25305220221534 in words is "twenty-five trillion, three hundred five billion, two hundred twenty million, two hundred twenty-one thousand, five hundred thirty-four".