125351281865 has 4 divisors (see below), whose sum is σ = 150421538244. Its totient is φ = 100281025488.

The previous prime is 125351281807. The next prime is 125351281877. The reversal of 125351281865 is 568182153521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21266972224 + 104084309641 = 145832^2 + 322621^2 .

It is a cyclic number.

It is not a de Polignac number, because 125351281865 - 2¹⁶ = 125351216329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12535128182 + ... + 12535128191.

It is an arithmetic number, because the mean of its divisors is an integer number (37605384561).

Almost surely, 2^125351281865 is an apocalyptic number.

It is an amenable number.

125351281865 is a deficient number, since it is larger than the sum of its proper divisors (25070256379).

125351281865 is an equidigital number, since it uses as much as digits as its factorization.

125351281865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25070256378.

The product of its digits is 576000, while the sum is 47.

The spelling of 125351281865 in words is "one hundred twenty-five billion, three hundred fifty-one million, two hundred eighty-one thousand, eight hundred sixty-five".