25401543501 has 4 divisors (see below), whose sum is σ = 33868724672. Its totient is φ = 16934362332.

The previous prime is 25401543493. The next prime is 25401543523. The reversal of 25401543501 is 10534510452.

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 not a de Polignac number, because 25401543501 - 2³ = 25401543493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25401542501) 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, 4233590581 + ... + 4233590586.

It is an arithmetic number, because the mean of its divisors is an integer number (8467181168).

Almost surely, 2^25401543501 is an apocalyptic number.

It is an amenable number.

25401543501 is a deficient number, since it is larger than the sum of its proper divisors (8467181171).

25401543501 is an equidigital number, since it uses as much as digits as its factorization.

25401543501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8467181170.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 25401543501 in words is "twenty-five billion, four hundred one million, five hundred forty-three thousand, five hundred one".