216510794149 has 8 divisors (see below), whose sum is σ = 235304604920. Its totient is φ = 198022574016.

The previous prime is 216510794131. The next prime is 216510794167. The reversal of 216510794149 is 941497015612.

It is an interprime number because it is at equal distance from previous prime (216510794131) and next prime (216510794167).

It can be written as a sum of positive squares in 4 ways, for example, as 37251702049 + 179259092100 = 193007^2 + 423390^2 .

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 216510794149 - 2¹¹ = 216510792101 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 (216510794189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76396182 + ... + 76399015.

It is an arithmetic number, because the mean of its divisors is an integer number (29413075615).

Almost surely, 2^216510794149 is an apocalyptic number.

It is an amenable number.

216510794149 is a deficient number, since it is larger than the sum of its proper divisors (18793810771).

216510794149 is a wasteful number, since it uses less digits than its factorization.

216510794149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152795319.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 216510794149 in words is "two hundred sixteen billion, five hundred ten million, seven hundred ninety-four thousand, one hundred forty-nine".