25977534450 has 192 divisors, whose sum is σ = 77137920000. Its totient is φ = 5659879680.

The previous prime is 25977534413. The next prime is 25977534463. The reversal of 25977534450 is 5443577952.

It is a super-2 number, since 2×25977534450² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25977534393 and 25977534402.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2400151 + ... + 2410949.

It is an arithmetic number, because the mean of its divisors is an integer number (401760000).

Almost surely, 2^25977534450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25977534450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38568960000).

25977534450 is an abundant number, since it is smaller than the sum of its proper divisors (51160385550).

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

25977534450 is a wasteful number, since it uses less digits than its factorization.

25977534450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10929 (or 10924 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 51.

The spelling of 25977534450 in words is "twenty-five billion, nine hundred seventy-seven million, five hundred thirty-four thousand, four hundred fifty".