161224666831 has 2 divisors, whose sum is σ = 161224666832. Its totient is φ = 161224666830.

The previous prime is 161224666787. The next prime is 161224666853. The reversal of 161224666831 is 138666422161.

It is a strong prime.

It is an emirp because it is prime and its reverse (138666422161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161224666831 - 2²¹ = 161222569679 is a prime.

It is a super-2 number, since 2×161224666831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161224666871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80612333415 + 80612333416.

It is an arithmetic number, because the mean of its divisors is an integer number (80612333416).

Almost surely, 2^161224666831 is an apocalyptic number.

161224666831 is a deficient number, since it is larger than the sum of its proper divisors (1).

161224666831 is an equidigital number, since it uses as much as digits as its factorization.

161224666831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 46.

The spelling of 161224666831 in words is "one hundred sixty-one billion, two hundred twenty-four million, six hundred sixty-six thousand, eight hundred thirty-one".