1966428625 has 16 divisors (see below), whose sum is σ = 2804690304. Its totient is φ = 1348407600.

The previous prime is 1966428623. The next prime is 1966428671. The reversal of 1966428625 is 5268246691.

It is not a de Polignac number, because 1966428625 - 2¹ = 1966428623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966428623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1122799 + ... + 1124548.

It is an arithmetic number, because the mean of its divisors is an integer number (175293144).

Almost surely, 2^1966428625 is an apocalyptic number.

It is an amenable number.

1966428625 is a deficient number, since it is larger than the sum of its proper divisors (838261679).

1966428625 is an equidigital number, since it uses as much as digits as its factorization.

1966428625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247369 (or 2247359 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The square root of 1966428625 is about 44344.4317248513. The cubic root of 1966428625 is about 1252.8316870615.

The spelling of 1966428625 in words is "one billion, nine hundred sixty-six million, four hundred twenty-eight thousand, six hundred twenty-five".