1966651725 has 24 divisors (see below), whose sum is σ = 3253622112. Its totient is φ = 1048206400.

The previous prime is 1966651721. The next prime is 1966651747. The reversal of 1966651725 is 5271566691.

It is not a de Polignac number, because 1966651725 - 2² = 1966651721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966651721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122410 + ... + 137540.

It is an arithmetic number, because the mean of its divisors is an integer number (135567588).

Almost surely, 2^1966651725 is an apocalyptic number.

1966651725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1966651725 is a deficient number, since it is larger than the sum of its proper divisors (1286970387).

1966651725 is a wasteful number, since it uses less digits than its factorization.

1966651725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16877 (or 16872 counting only the distinct ones).

The product of its digits is 680400, while the sum is 48.

The square root of 1966651725 is about 44346.9471891809. The cubic root of 1966651725 is about 1252.8790650299.

The spelling of 1966651725 in words is "one billion, nine hundred sixty-six million, six hundred fifty-one thousand, seven hundred twenty-five".