125442777989 has 2 divisors, whose sum is σ = 125442777990. Its totient is φ = 125442777988.

The previous prime is 125442777979. The next prime is 125442778049. The reversal of 125442777989 is 989777244521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123927233089 + 1515544900 = 352033^2 + 38930^2 .

It is a cyclic number.

It is not a de Polignac number, because 125442777989 - 2¹⁶ = 125442712453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125442777959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62721388994 + 62721388995.

It is an arithmetic number, because the mean of its divisors is an integer number (62721388995).

Almost surely, 2^125442777989 is an apocalyptic number.

It is an amenable number.

125442777989 is a deficient number, since it is larger than the sum of its proper divisors (1).

125442777989 is an equidigital number, since it uses as much as digits as its factorization.

125442777989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71124480, while the sum is 65.

The spelling of 125442777989 in words is "one hundred twenty-five billion, four hundred forty-two million, seven hundred seventy-seven thousand, nine hundred eighty-nine".