166121535 has 24 divisors (see below), whose sum is σ = 282356496. Its totient is φ = 83384320.

The previous prime is 166121533. The next prime is 166121539. The reversal of 166121535 is 535121661.

It is not a de Polignac number, because 166121535 - 2¹ = 166121533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166121533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14826 + ... + 23495.

It is an arithmetic number, because the mean of its divisors is an integer number (11764854).

Almost surely, 2^166121535 is an apocalyptic number.

166121535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166121535 is a deficient number, since it is larger than the sum of its proper divisors (116234961).

166121535 is a wasteful number, since it uses less digits than its factorization.

166121535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38363 (or 38346 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 166121535 is about 12888.8143364702. The cubic root of 166121535 is about 549.7205577705.

The spelling of 166121535 in words is "one hundred sixty-six million, one hundred twenty-one thousand, five hundred thirty-five".