25401221945 has 32 divisors (see below), whose sum is σ = 34834752000. Its totient is φ = 17610727680.

The previous prime is 25401221933. The next prime is 25401221969. The reversal of 25401221945 is 54912210452.

It is not a de Polignac number, because 25401221945 - 2⁴ = 25401221929 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 25211 + ... + 226799.

It is an arithmetic number, because the mean of its divisors is an integer number (1088586000).

Almost surely, 2^25401221945 is an apocalyptic number.

It is an amenable number.

25401221945 is a deficient number, since it is larger than the sum of its proper divisors (9433530055).

25401221945 is a wasteful number, since it uses less digits than its factorization.

25401221945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201713.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 25401221945 in words is "twenty-five billion, four hundred one million, two hundred twenty-one thousand, nine hundred forty-five".