425978957689 has 2 divisors, whose sum is σ = 425978957690. Its totient is φ = 425978957688.

The previous prime is 425978957557. The next prime is 425978957779. The reversal of 425978957689 is 986759879524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222343370089 + 203635587600 = 471533^2 + 451260^2 .

It is a cyclic number.

It is not a de Polignac number, because 425978957689 - 2¹⁹ = 425978433401 is a prime.

It is not a weakly prime, because it can be changed into another prime (425978957389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212989478844 + 212989478845.

It is an arithmetic number, because the mean of its divisors is an integer number (212989478845).

Almost surely, 2^425978957689 is an apocalyptic number.

It is an amenable number.

425978957689 is a deficient number, since it is larger than the sum of its proper divisors (1).

425978957689 is an equidigital number, since it uses as much as digits as its factorization.

425978957689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2743372800, while the sum is 79.

The spelling of 425978957689 in words is "four hundred twenty-five billion, nine hundred seventy-eight million, nine hundred fifty-seven thousand, six hundred eighty-nine".