25165261001 has 4 divisors (see below), whose sum is σ = 25172473104. Its totient is φ = 25158048900.

The previous prime is 25165260959. The next prime is 25165261013. The reversal of 25165261001 is 10016256152.

It is a happy number.

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 25165261001 - 2⁶ = 25165260937 is a prime.

It is a super-2 number, since 2×25165261001² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25165261061) 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, 3600815 + ... + 3607796.

It is an arithmetic number, because the mean of its divisors is an integer number (6293118276).

Almost surely, 2^25165261001 is an apocalyptic number.

It is an amenable number.

25165261001 is a deficient number, since it is larger than the sum of its proper divisors (7212103).

25165261001 is an equidigital number, since it uses as much as digits as its factorization.

25165261001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7212102.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 25165261001 in words is "twenty-five billion, one hundred sixty-five million, two hundred sixty-one thousand, one".