216451996 has 6 divisors (see below), whose sum is σ = 378791000. Its totient is φ = 108225996.

The previous prime is 216451993. The next prime is 216451999. The reversal of 216451996 is 699154612.

It is an interprime number because it is at equal distance from previous prime (216451993) and next prime (216451999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216451993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27056496 + ... + 27056503.

Almost surely, 2^216451996 is an apocalyptic number.

It is an amenable number.

216451996 is a deficient number, since it is larger than the sum of its proper divisors (162339004).

216451996 is a wasteful number, since it uses less digits than its factorization.

216451996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54113003 (or 54113001 counting only the distinct ones).

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

The square root of 216451996 is about 14712.3076368053. The cubic root of 216451996 is about 600.4182232293.

The spelling of 216451996 in words is "two hundred sixteen million, four hundred fifty-one thousand, nine hundred ninety-six".