66533631 has 8 divisors (see below), whose sum is σ = 93929904. Its totient is φ = 41746560.

The previous prime is 66533591. The next prime is 66533633. The reversal of 66533631 is 13633566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66533631 - 2¹⁰ = 66532607 is a prime.

It is a super-2 number, since 2×66533631² = 8853448108088322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 66533592 and 66533601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66533633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 652240 + ... + 652341.

It is an arithmetic number, because the mean of its divisors is an integer number (11741238).

Almost surely, 2^66533631 is an apocalyptic number.

66533631 is a deficient number, since it is larger than the sum of its proper divisors (27396273).

66533631 is a wasteful number, since it uses less digits than its factorization.

66533631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304601.

The product of its digits is 29160, while the sum is 33.

The square root of 66533631 is about 8156.8150034189. The cubic root of 66533631 is about 405.2102368303.

The spelling of 66533631 in words is "sixty-six million, five hundred thirty-three thousand, six hundred thirty-one".