66764653 has 4 divisors (see below), whose sum is σ = 69667488. Its totient is φ = 63861820.

The previous prime is 66764647. The next prime is 66764671. The reversal of 66764653 is 35646766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66764653 - 2⁹ = 66764141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66764603) 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, 1451383 + ... + 1451428.

It is an arithmetic number, because the mean of its divisors is an integer number (17416872).

Almost surely, 2^66764653 is an apocalyptic number.

It is an amenable number.

66764653 is a deficient number, since it is larger than the sum of its proper divisors (2902835).

66764653 is a wasteful number, since it uses less digits than its factorization.

66764653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902834.

The product of its digits is 544320, while the sum is 43.

The square root of 66764653 is about 8170.9640190127. The cubic root of 66764653 is about 405.6786933464.

The spelling of 66764653 in words is "sixty-six million, seven hundred sixty-four thousand, six hundred fifty-three".