125621666894 has 4 divisors (see below), whose sum is σ = 188432500344. Its totient is φ = 62810833446.

The previous prime is 125621666873. The next prime is 125621666903. The reversal of 125621666894 is 498666126521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 498666126521 = 9631 ⋅51777191.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 31405416722 + ... + 31405416725.

It is an arithmetic number, because the mean of its divisors is an integer number (47108125086).

Almost surely, 2^125621666894 is an apocalyptic number.

125621666894 is a deficient number, since it is larger than the sum of its proper divisors (62810833450).

125621666894 is an equidigital number, since it uses as much as digits as its factorization.

125621666894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62810833449.

The product of its digits is 7464960, while the sum is 56.

The spelling of 125621666894 in words is "one hundred twenty-five billion, six hundred twenty-one million, six hundred sixty-six thousand, eight hundred ninety-four".