25081357561 has 8 divisors (see below), whose sum is σ = 28185071040. Its totient is φ = 22145412432.

The previous prime is 25081357559. The next prime is 25081357583. The reversal of 25081357561 is 16575318052.

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 25081357561 - 2¹ = 25081357559 is a prime.

It is a super-3 number, since 3×25081357561³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25081357361) 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, 41941771 + ... + 41942368.

It is an arithmetic number, because the mean of its divisors is an integer number (3523133880).

Almost surely, 2^25081357561 is an apocalyptic number.

It is an amenable number.

25081357561 is a deficient number, since it is larger than the sum of its proper divisors (3103713479).

25081357561 is a wasteful number, since it uses less digits than its factorization.

25081357561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83884175.

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 25081357561 in words is "twenty-five billion, eighty-one million, three hundred fifty-seven thousand, five hundred sixty-one".