166015553437 has 2 divisors, whose sum is σ = 166015553438. Its totient is φ = 166015553436.

The previous prime is 166015553383. The next prime is 166015553441. The reversal of 166015553437 is 734355510661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85489572996 + 80525980441 = 292386^2 + 283771^2 .

It is a cyclic number.

It is not a de Polignac number, because 166015553437 - 2⁷ = 166015553309 is a prime.

It is a super-2 number, since 2×166015553437² (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 (166015553477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83007776718 + 83007776719.

It is an arithmetic number, because the mean of its divisors is an integer number (83007776719).

Almost surely, 2^166015553437 is an apocalyptic number.

It is an amenable number.

166015553437 is a deficient number, since it is larger than the sum of its proper divisors (1).

166015553437 is an equidigital number, since it uses as much as digits as its factorization.

166015553437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134000, while the sum is 46.

The spelling of 166015553437 in words is "one hundred sixty-six billion, fifteen million, five hundred fifty-three thousand, four hundred thirty-seven".