25978378212 has 24 divisors (see below), whose sum is σ = 67351351200. Its totient is φ = 8659459368.

The previous prime is 25978378201. The next prime is 25978378213. The reversal of 25978378212 is 21287387952.

25978378212 is a `hidden beast` number, since 2 + 59 + 7 + 8 + 378 + 212 = 666.

It is a super-2 number, since 2×25978378212² (a number of 22 digits) contains 22 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 (25978378213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120270162 + ... + 120270377.

It is an arithmetic number, because the mean of its divisors is an integer number (2806306300).

Almost surely, 2^25978378212 is an apocalyptic number.

It is an amenable number.

25978378212 is an abundant number, since it is smaller than the sum of its proper divisors (41372972988).

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

25978378212 is a wasteful number, since it uses less digits than its factorization.

25978378212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240540552 (or 240540544 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 25978378212 in words is "twenty-five billion, nine hundred seventy-eight million, three hundred seventy-eight thousand, two hundred twelve".