316661617730821 has 64 divisors (see below), whose sum is σ = 373072044360960. Its totient is φ = 265976476416000.

The previous prime is 316661617730719. The next prime is 316661617730827. The reversal of 316661617730821 is 128037716166613.

It is a cyclic number.

It is not a de Polignac number, because 316661617730821 - 2¹⁷ = 316661617599749 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 (316661617730827) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13334793270 + ... + 13334817016.

It is an arithmetic number, because the mean of its divisors is an integer number (5829250693140).

Almost surely, 2^{316661617730821} is an apocalyptic number.

It is an amenable number.

316661617730821 is a deficient number, since it is larger than the sum of its proper divisors (56410426630139).

316661617730821 is a wasteful number, since it uses less digits than its factorization.

316661617730821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42406.

The product of its (nonzero) digits is 9144576, while the sum is 58.

The spelling of 316661617730821 in words is "three hundred sixteen trillion, six hundred sixty-one billion, six hundred seventeen million, seven hundred thirty thousand, eight hundred twenty-one".