25355520401 has 4 divisors (see below), whose sum is σ = 25733961072. Its totient is φ = 24977079732.

The previous prime is 25355520371. The next prime is 25355520427. The reversal of 25355520401 is 10402555352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25355520401 - 2¹⁰ = 25355519377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25355520301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189220235 + ... + 189220368.

It is an arithmetic number, because the mean of its divisors is an integer number (6433490268).

Almost surely, 2^25355520401 is an apocalyptic number.

It is an amenable number.

25355520401 is a deficient number, since it is larger than the sum of its proper divisors (378440671).

25355520401 is an equidigital number, since it uses as much as digits as its factorization.

25355520401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378440670.

The product of its (nonzero) digits is 30000, while the sum is 32.

The spelling of 25355520401 in words is "twenty-five billion, three hundred fifty-five million, five hundred twenty thousand, four hundred one".