2166155240537 has 2 divisors, whose sum is σ = 2166155240538. Its totient is φ = 2166155240536.

The previous prime is 2166155240521. The next prime is 2166155240563. The reversal of 2166155240537 is 7350425516612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1888414646416 + 277740594121 = 1374196^2 + 527011^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166155240537 - 2⁴ = 2166155240521 is a prime.

It is a super-2 number, since 2×2166155240537² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2166155240491 and 2166155240500.

It is not a weakly prime, because it can be changed into another prime (2166155245537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083077620268 + 1083077620269.

It is an arithmetic number, because the mean of its divisors is an integer number (1083077620269).

Almost surely, 2^{2166155240537} is an apocalyptic number.

It is an amenable number.

2166155240537 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166155240537 is an equidigital number, since it uses as much as digits as its factorization.

2166155240537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512000, while the sum is 47.

The spelling of 2166155240537 in words is "two trillion, one hundred sixty-six billion, one hundred fifty-five million, two hundred forty thousand, five hundred thirty-seven".