125623014657781 has 2 divisors, whose sum is σ = 125623014657782. Its totient is φ = 125623014657780.

The previous prime is 125623014657739. The next prime is 125623014657853. The reversal of 125623014657781 is 187756410326521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87637869480100 + 37985145177681 = 9361510^2 + 6163209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125623014657781 is a prime.

It is a super-2 number, since 2×125623014657781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125623014697781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62811507328890 + 62811507328891.

It is an arithmetic number, because the mean of its divisors is an integer number (62811507328891).

Almost surely, 2^{125623014657781} is an apocalyptic number.

It is an amenable number.

125623014657781 is a deficient number, since it is larger than the sum of its proper divisors (1).

125623014657781 is an equidigital number, since it uses as much as digits as its factorization.

125623014657781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 58.

The spelling of 125623014657781 in words is "one hundred twenty-five trillion, six hundred twenty-three billion, fourteen million, six hundred fifty-seven thousand, seven hundred eighty-one".