166015553531 has 4 divisors (see below), whose sum is σ = 166025798064. Its totient is φ = 166005309000.

The previous prime is 166015553479. The next prime is 166015553551. The reversal of 166015553531 is 135355510661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166015553531 - 2¹⁴ = 166015537147 is a prime.

It is a super-2 number, since 2×166015553531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166015553551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5097920 + ... + 5130381.

It is an arithmetic number, because the mean of its divisors is an integer number (41506449516).

Almost surely, 2^166015553531 is an apocalyptic number.

166015553531 is a deficient number, since it is larger than the sum of its proper divisors (10244533).

166015553531 is a wasteful number, since it uses less digits than its factorization.

166015553531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10244532.

The product of its (nonzero) digits is 202500, while the sum is 41.

The spelling of 166015553531 in words is "one hundred sixty-six billion, fifteen million, five hundred fifty-three thousand, five hundred thirty-one".