64551551 has 2 divisors, whose sum is σ = 64551552. Its totient is φ = 64551550.

The previous prime is 64551541. The next prime is 64551577. The reversal of 64551551 is 15515546.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64551551 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64551511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32275775 + 32275776.

It is an arithmetic number, because the mean of its divisors is an integer number (32275776).

Almost surely, 2^64551551 is an apocalyptic number.

64551551 is a deficient number, since it is larger than the sum of its proper divisors (1).

64551551 is an equidigital number, since it uses as much as digits as its factorization.

64551551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15000, while the sum is 32.

The square root of 64551551 is about 8034.3979861593. The cubic root of 64551551 is about 401.1457794234.

The spelling of 64551551 in words is "sixty-four million, five hundred fifty-one thousand, five hundred fifty-one".