66928753 has 2 divisors, whose sum is σ = 66928754. Its totient is φ = 66928752.

The previous prime is 66928727. The next prime is 66928759. The reversal of 66928753 is 35782966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59783824 + 7144929 = 7732^2 + 2673^2 .

It is a cyclic number.

It is not a de Polignac number, because 66928753 - 2¹³ = 66920561 is a prime.

It is not a weakly prime, because it can be changed into another prime (66928759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33464376 + 33464377.

It is an arithmetic number, because the mean of its divisors is an integer number (33464377).

Almost surely, 2^66928753 is an apocalyptic number.

It is an amenable number.

66928753 is a deficient number, since it is larger than the sum of its proper divisors (1).

66928753 is an equidigital number, since it uses as much as digits as its factorization.

66928753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 46.

The square root of 66928753 is about 8180.9995110622. Note that the first 3 decimals coincide. The cubic root of 66928753 is about 406.0107922584.

The spelling of 66928753 in words is "sixty-six million, nine hundred twenty-eight thousand, seven hundred fifty-three".