125721206953 has 2 divisors, whose sum is σ = 125721206954. Its totient is φ = 125721206952.

The previous prime is 125721206929. The next prime is 125721206981. The reversal of 125721206953 is 359602127521.

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., 64124419984 + 61596786969 = 253228^2 + 248187^2 .

It is a cyclic number.

It is not a de Polignac number, because 125721206953 - 2²⁵ = 125687652521 is a prime.

It is not a weakly prime, because it can be changed into another prime (125721216953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62860603476 + 62860603477.

It is an arithmetic number, because the mean of its divisors is an integer number (62860603477).

Almost surely, 2^125721206953 is an apocalyptic number.

It is an amenable number.

125721206953 is a deficient number, since it is larger than the sum of its proper divisors (1).

125721206953 is an equidigital number, since it uses as much as digits as its factorization.

125721206953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 125721206953 in words is "one hundred twenty-five billion, seven hundred twenty-one million, two hundred six thousand, nine hundred fifty-three".