66453953 has 4 divisors (see below), whose sum is σ = 66798468. Its totient is φ = 66109440.

The previous prime is 66453943. The next prime is 66453977. The reversal of 66453953 is 35935466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40157569 + 26296384 = 6337^2 + 5128^2 .

It is a cyclic number.

It is not a de Polignac number, because 66453953 - 2⁶ = 66453889 is a prime.

It is a super-2 number, since 2×66453953² = 8832255738652418, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66453953.

It is not an unprimeable number, because it can be changed into a prime (66453913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171968 + ... + 172353.

It is an arithmetic number, because the mean of its divisors is an integer number (16699617).

Almost surely, 2^66453953 is an apocalyptic number.

It is an amenable number.

66453953 is a deficient number, since it is larger than the sum of its proper divisors (344515).

66453953 is a wasteful number, since it uses less digits than its factorization.

66453953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344514.

The product of its digits is 291600, while the sum is 41.

The square root of 66453953 is about 8151.9294035216. The cubic root of 66453953 is about 405.0484177241.

The spelling of 66453953 in words is "sixty-six million, four hundred fifty-three thousand, nine hundred fifty-three".