125511603561 has 12 divisors (see below), whose sum is σ = 182722056192. Its totient is φ = 83015548056.

The previous prime is 125511603533. The next prime is 125511603571. The reversal of 125511603561 is 165306115521.

125511603561 is a `hidden beast` number, since 1 + 2 + 551 + 16 + 0 + 35 + 61 = 666.

It is not a de Polignac number, because 125511603561 - 2¹⁹ = 125511079273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125511603521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54903321 + ... + 54905606.

It is an arithmetic number, because the mean of its divisors is an integer number (15226838016).

Almost surely, 2^125511603561 is an apocalyptic number.

It is an amenable number.

125511603561 is a deficient number, since it is larger than the sum of its proper divisors (57210452631).

125511603561 is a wasteful number, since it uses less digits than its factorization.

125511603561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109809060 (or 109809057 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 125511603561 in words is "one hundred twenty-five billion, five hundred eleven million, six hundred three thousand, five hundred sixty-one".