216701375749 has 2 divisors, whose sum is σ = 216701375750. Its totient is φ = 216701375748.

The previous prime is 216701375663. The next prime is 216701375809. The reversal of 216701375749 is 947573107612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154472580900 + 62228794849 = 393030^2 + 249457^2 .

It is a cyclic number.

It is not a de Polignac number, because 216701375749 - 2²³ = 216692987141 is a prime.

It is a super-2 number, since 2×216701375749² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216701375696 and 216701375705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216701375249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108350687874 + 108350687875.

It is an arithmetic number, because the mean of its divisors is an integer number (108350687875).

Almost surely, 2^216701375749 is an apocalyptic number.

It is an amenable number.

216701375749 is a deficient number, since it is larger than the sum of its proper divisors (1).

216701375749 is an equidigital number, since it uses as much as digits as its factorization.

216701375749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2222640, while the sum is 52.

The spelling of 216701375749 in words is "two hundred sixteen billion, seven hundred one million, three hundred seventy-five thousand, seven hundred forty-nine".