216451644747 has 48 divisors (see below), whose sum is σ = 331354106208. Its totient is φ = 125190973440.

The previous prime is 216451644743. The next prime is 216451644749. The reversal of 216451644747 is 747446154612.

It is not a de Polignac number, because 216451644747 - 2² = 216451644743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 216451644747.

It is not an unprimeable number, because it can be changed into a prime (216451644743) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6300597 + ... + 6334857.

It is an arithmetic number, because the mean of its divisors is an integer number (6903210546).

Almost surely, 2^216451644747 is an apocalyptic number.

216451644747 is a deficient number, since it is larger than the sum of its proper divisors (114902461461).

216451644747 is a wasteful number, since it uses less digits than its factorization.

216451644747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35040 (or 35027 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 51.

The spelling of 216451644747 in words is "two hundred sixteen billion, four hundred fifty-one million, six hundred forty-four thousand, seven hundred forty-seven".