125722661 has 2 divisors, whose sum is σ = 125722662. Its totient is φ = 125722660.

The previous prime is 125722643. The next prime is 125722693. The reversal of 125722661 is 166227521.

It is an a-pointer prime, because the next prime (125722693) can be obtained adding 125722661 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125574436 + 148225 = 11206^2 + 385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125722661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125722631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62861330 + 62861331.

It is an arithmetic number, because the mean of its divisors is an integer number (62861331).

Almost surely, 2^125722661 is an apocalyptic number.

It is an amenable number.

125722661 is a deficient number, since it is larger than the sum of its proper divisors (1).

125722661 is an equidigital number, since it uses as much as digits as its factorization.

125722661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 125722661 is about 11212.6116939810. The cubic root of 125722661 is about 500.9616970915.

The spelling of 125722661 in words is "one hundred twenty-five million, seven hundred twenty-two thousand, six hundred sixty-one".