66450031 has 4 divisors (see below), whose sum is σ = 66473352. Its totient is φ = 66426712.

The previous prime is 66450029. The next prime is 66450061. The reversal of 66450031 is 13005466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13005466 = 2 ⋅6502733.

It is a cyclic number.

It is not a de Polignac number, because 66450031 - 2¹ = 66450029 is a prime.

It is a super-2 number, since 2×66450031² = 8831213239801922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66449978 and 66450005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66450061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6676 + ... + 13321.

It is an arithmetic number, because the mean of its divisors is an integer number (16618338).

Almost surely, 2^66450031 is an apocalyptic number.

66450031 is a deficient number, since it is larger than the sum of its proper divisors (23321).

66450031 is a wasteful number, since it uses less digits than its factorization.

66450031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23320.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 66450031 is about 8151.6888434238. The cubic root of 66450031 is about 405.0404491430.

Adding to 66450031 its reverse (13005466), we get a palindrome (79455497).

The spelling of 66450031 in words is "sixty-six million, four hundred fifty thousand, thirty-one".