25420163555 has 8 divisors (see below), whose sum is σ = 32109680400. Its totient is φ = 19265808096.

The previous prime is 25420163519. The next prime is 25420163579. The reversal of 25420163555 is 55536102452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25420163555 - 2¹⁰ = 25420162531 is a prime.

It is a super-4 number, since 4×25420163555⁴ (a number of 43 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133790240 + ... + 133790429.

It is an arithmetic number, because the mean of its divisors is an integer number (4013710050).

Almost surely, 2^25420163555 is an apocalyptic number.

25420163555 is a deficient number, since it is larger than the sum of its proper divisors (6689516845).

25420163555 is a wasteful number, since it uses less digits than its factorization.

25420163555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267580693.

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 25420163555 in words is "twenty-five billion, four hundred twenty million, one hundred sixty-three thousand, five hundred fifty-five".