216431346651 has 32 divisors (see below), whose sum is σ = 312319687680. Its totient is φ = 132526944384.

The previous prime is 216431346641. The next prime is 216431346661. The reversal of 216431346651 is 156643134612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (216431346641) and next prime (216431346661).

It is not a de Polignac number, because 216431346651 - 2¹⁴ = 216431330267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216431346641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9086065 + ... + 9109853.

It is an arithmetic number, because the mean of its divisors is an integer number (9759990240).

Almost surely, 2^216431346651 is an apocalyptic number.

216431346651 is a deficient number, since it is larger than the sum of its proper divisors (95888341029).

216431346651 is a wasteful number, since it uses less digits than its factorization.

216431346651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24955.

The product of its digits is 311040, while the sum is 42.

The spelling of 216431346651 in words is "two hundred sixteen billion, four hundred thirty-one million, three hundred forty-six thousand, six hundred fifty-one".