25058057778 has 80 divisors (see below), whose sum is σ = 60547659480. Its totient is φ = 7699981824.

The previous prime is 25058057771. The next prime is 25058057797. The reversal of 25058057778 is 87775085052.

25058057778 is a `hidden beast` number, since 2 + 5 + 0 + 580 + 57 + 7 + 7 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 21396960729 + 3661097049 = 146277^2 + 60507^2 .

It is a super-3 number, since 3×25058057778³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (25058057771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1671018 + ... + 1685946.

Almost surely, 2^25058057778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25058057778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30273829740).

25058057778 is an abundant number, since it is smaller than the sum of its proper divisors (35489601702).

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

25058057778 is a wasteful number, since it uses less digits than its factorization.

25058057778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15753 (or 15744 counting only the distinct ones).

The product of its (nonzero) digits is 5488000, while the sum is 54.

The spelling of 25058057778 in words is "twenty-five billion, fifty-eight million, fifty-seven thousand, seven hundred seventy-eight".