25445621772 has 24 divisors (see below), whose sum is σ = 65970130800. Its totient is φ = 8481873888.

The previous prime is 25445621711. The next prime is 25445621783. The reversal of 25445621772 is 27712654452.

25445621772 is a `hidden beast` number, since 2 + 5 + 4 + 4 + 562 + 17 + 72 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117803697 + ... + 117803912.

It is an arithmetic number, because the mean of its divisors is an integer number (2748755450).

Almost surely, 2^25445621772 is an apocalyptic number.

It is an amenable number.

25445621772 is an abundant number, since it is smaller than the sum of its proper divisors (40524509028).

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

25445621772 is a wasteful number, since it uses less digits than its factorization.

25445621772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235607622 (or 235607614 counting only the distinct ones).

The product of its digits is 940800, while the sum is 45.

The spelling of 25445621772 in words is "twenty-five billion, four hundred forty-five million, six hundred twenty-one thousand, seven hundred seventy-two".