25068778161 has 8 divisors (see below), whose sum is σ = 38200042944. Its totient is φ = 14325016080.

The previous prime is 25068778139. The next prime is 25068778169. The reversal of 25068778161 is 16187786052.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25068778161 - 2²¹ = 25066681009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25068778169) 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 7 ways as a sum of consecutive naturals, for example, 596875650 + ... + 596875691.

It is an arithmetic number, because the mean of its divisors is an integer number (4775005368).

Almost surely, 2^25068778161 is an apocalyptic number.

25068778161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25068778161 is a deficient number, since it is larger than the sum of its proper divisors (13131264783).

25068778161 is a wasteful number, since it uses less digits than its factorization.

25068778161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193751351.

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 25068778161 in words is "twenty-five billion, sixty-eight million, seven hundred seventy-eight thousand, one hundred sixty-one".