25203215453551 has 4 divisors (see below), whose sum is σ = 26685757539072. Its totient is φ = 23720673368032.

The previous prime is 25203215453519. The next prime is 25203215453557. The reversal of 25203215453551 is 15535451230252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25203215453551 - 2⁵ = 25203215453519 is a prime.

It is a super-2 number, since 2×25203215453551² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25203215453498 and 25203215453507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25203215453557) 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, 741271042735 + ... + 741271042768.

It is an arithmetic number, because the mean of its divisors is an integer number (6671439384768).

Almost surely, 2^{25203215453551} is an apocalyptic number.

25203215453551 is a deficient number, since it is larger than the sum of its proper divisors (1482542085521).

25203215453551 is a wasteful number, since it uses less digits than its factorization.

25203215453551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482542085520.

The product of its (nonzero) digits is 900000, while the sum is 43.

The spelling of 25203215453551 in words is "twenty-five trillion, two hundred three billion, two hundred fifteen million, four hundred fifty-three thousand, five hundred fifty-one".