25801520162001 has 16 divisors (see below), whose sum is σ = 34537325581440. Its totient is φ = 17133391537920.

The previous prime is 25801520161993. The next prime is 25801520162027. The reversal of 25801520162001 is 10026102510852.

It is not a de Polignac number, because 25801520162001 - 2³ = 25801520161993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25801520162071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334761 + ... + 7191321.

It is an arithmetic number, because the mean of its divisors is an integer number (2158582848840).

Almost surely, 2^{25801520162001} is an apocalyptic number.

It is an amenable number.

25801520162001 is a deficient number, since it is larger than the sum of its proper divisors (8735805419439).

25801520162001 is a wasteful number, since it uses less digits than its factorization.

25801520162001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6861496.

The product of its (nonzero) digits is 9600, while the sum is 33.

Adding to 25801520162001 its reverse (10026102510852), we get a palindrome (35827622672853).

The spelling of 25801520162001 in words is "twenty-five trillion, eight hundred one billion, five hundred twenty million, one hundred sixty-two thousand, one".