125205155503 has 4 divisors (see below), whose sum is σ = 126495930400. Its totient is φ = 123914380608.

The previous prime is 125205155501. The next prime is 125205155539. The reversal of 125205155503 is 305551502521.

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 125205155503 - 2¹ = 125205155501 is a prime.

It is a super-2 number, since 2×125205155503² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125205155501) 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, 645387303 + ... + 645387496.

It is an arithmetic number, because the mean of its divisors is an integer number (31623982600).

Almost surely, 2^125205155503 is an apocalyptic number.

125205155503 is a deficient number, since it is larger than the sum of its proper divisors (1290774897).

125205155503 is an equidigital number, since it uses as much as digits as its factorization.

125205155503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290774896.

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 125205155503 in words is "one hundred twenty-five billion, two hundred five million, one hundred fifty-five thousand, five hundred three".