2161626535997 has 2 divisors, whose sum is σ = 2161626535998. Its totient is φ = 2161626535996.

The previous prime is 2161626535919. The next prime is 2161626536039. The reversal of 2161626535997 is 7995356261612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2003275067641 + 158351468356 = 1415371^2 + 397934^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161626535997 - 2¹² = 2161626531901 is a prime.

It is a super-2 number, since 2×2161626535997² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161626535907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080813267998 + 1080813267999.

It is an arithmetic number, because the mean of its divisors is an integer number (1080813267999).

Almost surely, 2^{2161626535997} is an apocalyptic number.

It is an amenable number.

2161626535997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161626535997 is an equidigital number, since it uses as much as digits as its factorization.

2161626535997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36741600, while the sum is 62.

The spelling of 2161626535997 in words is "two trillion, one hundred sixty-one billion, six hundred twenty-six million, five hundred thirty-five thousand, nine hundred ninety-seven".