64771633 has 2 divisors, whose sum is σ = 64771634. Its totient is φ = 64771632.

The previous prime is 64771621. The next prime is 64771643. The reversal of 64771633 is 33617746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64754209 + 17424 = 8047^2 + 132^2 .

It is a cyclic number.

It is not a de Polignac number, because 64771633 - 2¹³ = 64763441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64771592 and 64771601.

It is not a weakly prime, because it can be changed into another prime (64771613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32385816 + 32385817.

It is an arithmetic number, because the mean of its divisors is an integer number (32385817).

Almost surely, 2^64771633 is an apocalyptic number.

It is an amenable number.

64771633 is a deficient number, since it is larger than the sum of its proper divisors (1).

64771633 is an equidigital number, since it uses as much as digits as its factorization.

64771633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 37.

The square root of 64771633 is about 8048.0825666739. The cubic root of 64771633 is about 401.6011509870.

The spelling of 64771633 in words is "sixty-four million, seven hundred seventy-one thousand, six hundred thirty-three".