66161535 has 64 divisors (see below), whose sum is σ = 124001280. Its totient is φ = 29767680.

The previous prime is 66161531. The next prime is 66161551. The reversal of 66161535 is 53516166.

It is not a de Polignac number, because 66161535 - 2² = 66161531 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 66161496 and 66161505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66161531) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 288801 + ... + 289029.

It is an arithmetic number, because the mean of its divisors is an integer number (1937520).

Almost surely, 2^66161535 is an apocalyptic number.

66161535 is a deficient number, since it is larger than the sum of its proper divisors (57839745).

66161535 is a wasteful number, since it uses less digits than its factorization.

66161535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368.

The product of its digits is 16200, while the sum is 33.

The square root of 66161535 is about 8133.9741209325. The cubic root of 66161535 is about 404.4534312806.

The spelling of 66161535 in words is "sixty-six million, one hundred sixty-one thousand, five hundred thirty-five".