66772501 has 2 divisors, whose sum is σ = 66772502. Its totient is φ = 66772500.

The previous prime is 66772493. The next prime is 66772553. The reversal of 66772501 is 10527766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61936900 + 4835601 = 7870^2 + 2199^2 .

It is a cyclic number.

It is not a de Polignac number, because 66772501 - 2³ = 66772493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66772561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33386250 + 33386251.

It is an arithmetic number, because the mean of its divisors is an integer number (33386251).

Almost surely, 2^66772501 is an apocalyptic number.

It is an amenable number.

66772501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66772501 is an equidigital number, since it uses as much as digits as its factorization.

66772501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 66772501 is about 8171.4442419930. Note that the first 3 decimals coincide. The cubic root of 66772501 is about 405.6945881924.

The spelling of 66772501 in words is "sixty-six million, seven hundred seventy-two thousand, five hundred one".