216374556537731 has 2 divisors, whose sum is σ = 216374556537732. Its totient is φ = 216374556537730.

The previous prime is 216374556537703. The next prime is 216374556537787. The reversal of 216374556537731 is 137735655473612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216374556537731 - 2³⁴ = 216357376668547 is a prime.

It is a super-2 number, since 2×216374556537731² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216374556537631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108187278268865 + 108187278268866.

It is an arithmetic number, because the mean of its divisors is an integer number (108187278268866).

Almost surely, 2^{216374556537731} is an apocalyptic number.

216374556537731 is a deficient number, since it is larger than the sum of its proper divisors (1).

216374556537731 is an equidigital number, since it uses as much as digits as its factorization.

216374556537731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 333396000, while the sum is 65.

The spelling of 216374556537731 in words is "two hundred sixteen trillion, three hundred seventy-four billion, five hundred fifty-six million, five hundred thirty-seven thousand, seven hundred thirty-one".