1966161625 has 8 divisors (see below), whose sum is σ = 2453769864. Its totient is φ = 1572929200.

The previous prime is 1966161623. The next prime is 1966161643. The reversal of 1966161625 is 5261616691.

It can be written as a sum of positive squares in 4 ways, for example, as 162715536 + 1803446089 = 12756^2 + 42467^2 .

It is not a de Polignac number, because 1966161625 - 2¹ = 1966161623 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966161623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7864522 + ... + 7864771.

It is an arithmetic number, because the mean of its divisors is an integer number (306721233).

Almost surely, 2^1966161625 is an apocalyptic number.

It is an amenable number.

1966161625 is a deficient number, since it is larger than the sum of its proper divisors (487608239).

1966161625 is an equidigital number, since it uses as much as digits as its factorization.

1966161625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15729308 (or 15729298 counting only the distinct ones).

The product of its digits is 116640, while the sum is 43.

The square root of 1966161625 is about 44341.4210981110. The cubic root of 1966161625 is about 1252.7749816893.

The spelling of 1966161625 in words is "one billion, nine hundred sixty-six million, one hundred sixty-one thousand, six hundred twenty-five".