25534149648 has 40 divisors (see below), whose sum is σ = 75386538048. Its totient is φ = 7295471232.

The previous prime is 25534149629. The next prime is 25534149649. The reversal of 25534149648 is 84694143552.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 25534149648.

It is not an unprimeable number, because it can be changed into a prime (25534149649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37996911 + ... + 37997582.

Almost surely, 2^25534149648 is an apocalyptic number.

25534149648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25534149648 is an abundant number, since it is smaller than the sum of its proper divisors (49852388400).

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

25534149648 is a wasteful number, since it uses less digits than its factorization.

25534149648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75994511 (or 75994505 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 51.

The spelling of 25534149648 in words is "twenty-five billion, five hundred thirty-four million, one hundred forty-nine thousand, six hundred forty-eight".