1966216351 has 16 divisors (see below), whose sum is σ = 2163178368. Its totient is φ = 1772344800.

The previous prime is 1966216339. The next prime is 1966216393. The reversal of 1966216351 is 1536126691.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1966216351 - 2⁵ = 1966216319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966216321) 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, 969000 + ... + 971026.

It is an arithmetic number, because the mean of its divisors is an integer number (135198648).

Almost surely, 2^1966216351 is an apocalyptic number.

1966216351 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1966216351 is a deficient number, since it is larger than the sum of its proper divisors (196962017).

1966216351 is a wasteful number, since it uses less digits than its factorization.

1966216351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742.

The product of its digits is 58320, while the sum is 40.

The square root of 1966216351 is about 44342.0381917656. The cubic root of 1966216351 is about 1252.7866047974.

The spelling of 1966216351 in words is "one billion, nine hundred sixty-six million, two hundred sixteen thousand, three hundred fifty-one".