25678154520 has 128 divisors (see below), whose sum is σ = 85815288000. Its totient is φ = 6829793280.

The previous prime is 25678154507. The next prime is 25678154531. The reversal of 25678154520 is 2545187652.

25678154520 is a `hidden beast` number, since 2 + 5 + 6 + 7 + 81 + 545 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389560 + ... + 450680.

Almost surely, 2^25678154520 is an apocalyptic number.

25678154520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25678154520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42907644000).

25678154520 is an abundant number, since it is smaller than the sum of its proper divisors (60137133480).

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

25678154520 is a wasteful number, since it uses less digits than its factorization.

25678154520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61530 (or 61520 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 25678154520 in words is "twenty-five billion, six hundred seventy-eight million, one hundred fifty-four thousand, five hundred twenty".