125121511551 has 8 divisors (see below), whose sum is σ = 166830465024. Its totient is φ = 83413449560.

The previous prime is 125121511511. The next prime is 125121511573. The reversal of 125121511551 is 155115121521.

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 125121511551 - 2⁷ = 125121511423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125121511511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244840 + ... + 556946.

It is an arithmetic number, because the mean of its divisors is an integer number (20853808128).

Almost surely, 2^125121511551 is an apocalyptic number.

125121511551 is a deficient number, since it is larger than the sum of its proper divisors (41708953473).

125121511551 is a wasteful number, since it uses less digits than its factorization.

125121511551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445741.

The product of its digits is 2500, while the sum is 30.

The spelling of 125121511551 in words is "one hundred twenty-five billion, one hundred twenty-one million, five hundred eleven thousand, five hundred fifty-one".