615654511823161 has 2 divisors, whose sum is σ = 615654511823162. Its totient is φ = 615654511823160.

The previous prime is 615654511823093. The next prime is 615654511823233. The reversal of 615654511823161 is 161328115456516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357411540219561 + 258242971603600 = 18905331^2 + 16069940^2 .

It is a cyclic number.

It is not a de Polignac number, because 615654511823161 - 2¹¹ = 615654511821113 is a prime.

It is a super-2 number, since 2×615654511823161² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (615652511823161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307827255911580 + 307827255911581.

It is an arithmetic number, because the mean of its divisors is an integer number (307827255911581).

Almost surely, 2^{615654511823161} is an apocalyptic number.

It is an amenable number.

615654511823161 is a deficient number, since it is larger than the sum of its proper divisors (1).

615654511823161 is an equidigital number, since it uses as much as digits as its factorization.

615654511823161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184000, while the sum is 55.

The spelling of 615654511823161 in words is "six hundred fifteen trillion, six hundred fifty-four billion, five hundred eleven million, eight hundred twenty-three thousand, one hundred sixty-one".