218179281801653 has 2 divisors, whose sum is σ = 218179281801654. Its totient is φ = 218179281801652.

The previous prime is 218179281801557. The next prime is 218179281801697. The reversal of 218179281801653 is 356108182971812.

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., 218178246056164 + 1035745489 = 14770858^2 + 32183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218179281801653 is a prime.

It is a super-2 number, since 2×218179281801653² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218179281801253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109089640900826 + 109089640900827.

It is an arithmetic number, because the mean of its divisors is an integer number (109089640900827).

Almost surely, 2^{218179281801653} is an apocalyptic number.

It is an amenable number.

218179281801653 is a deficient number, since it is larger than the sum of its proper divisors (1).

218179281801653 is an equidigital number, since it uses as much as digits as its factorization.

218179281801653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11612160, while the sum is 62.

The spelling of 218179281801653 in words is "two hundred eighteen trillion, one hundred seventy-nine billion, two hundred eighty-one million, eight hundred one thousand, six hundred fifty-three".