1966428505 has 8 divisors (see below), whose sum is σ = 2498521032. Its totient is φ = 1480604928.

The previous prime is 1966428481. The next prime is 1966428551. The reversal of 1966428505 is 5058246691.

1966428505 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 969637321 + 996791184 = 31139^2 + 31572^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1966428505 - 2⁵ = 1966428473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11567142 + ... + 11567311.

It is an arithmetic number, because the mean of its divisors is an integer number (312315129).

Almost surely, 2^1966428505 is an apocalyptic number.

It is an amenable number.

1966428505 is a deficient number, since it is larger than the sum of its proper divisors (532092527).

1966428505 is a wasteful number, since it uses less digits than its factorization.

1966428505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23134475.

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 1966428505 is about 44344.4303718066. The cubic root of 1966428505 is about 1252.8316615771.

The spelling of 1966428505 in words is "one billion, nine hundred sixty-six million, four hundred twenty-eight thousand, five hundred five".