1966402525 has 6 divisors (see below), whose sum is σ = 2438339162. Its totient is φ = 1573122000.

The previous prime is 1966402519. The next prime is 1966402541. The reversal of 1966402525 is 5252046691.

It can be written as a sum of positive squares in 3 ways, for example, as 5861241 + 1960541284 = 2421^2 + 44278^2 .

It is not a de Polignac number, because 1966402525 - 2¹⁷ = 1966271453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39328026 + ... + 39328075.

Almost surely, 2^1966402525 is an apocalyptic number.

It is an amenable number.

1966402525 is a deficient number, since it is larger than the sum of its proper divisors (471936637).

1966402525 is an equidigital number, since it uses as much as digits as its factorization.

1966402525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78656111 (or 78656106 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 1966402525 is about 44344.1374366443. The cubic root of 1966402525 is about 1252.8261441784.

The spelling of 1966402525 in words is "one billion, nine hundred sixty-six million, four hundred two thousand, five hundred twenty-five".