25520772420 has 144 divisors (see below), whose sum is σ = 90946844352. Its totient is φ = 5710936320.

The previous prime is 25520772397. The next prime is 25520772421. The reversal of 25520772420 is 2427702552.

25520772420 is a `hidden beast` number, since 25 + 5 + 207 + 7 + 2 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25520772421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 470002 + ... + 521481.

It is an arithmetic number, because the mean of its divisors is an integer number (631575308).

Almost surely, 2^25520772420 is an apocalyptic number.

25520772420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25520772420 is an abundant number, since it is smaller than the sum of its proper divisors (65426071932).

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

25520772420 is a wasteful number, since it uses less digits than its factorization.

25520772420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991522 (or 991517 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 36.

The spelling of 25520772420 in words is "twenty-five billion, five hundred twenty million, seven hundred seventy-two thousand, four hundred twenty".