64742551 has 2 divisors, whose sum is σ = 64742552. Its totient is φ = 64742550.

The previous prime is 64742543. The next prime is 64742591. The reversal of 64742551 is 15524746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64742551 - 2³ = 64742543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64742591) 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, 32371275 + 32371276.

It is an arithmetic number, because the mean of its divisors is an integer number (32371276).

Almost surely, 2^64742551 is an apocalyptic number.

64742551 is a deficient number, since it is larger than the sum of its proper divisors (1).

64742551 is an equidigital number, since it uses as much as digits as its factorization.

64742551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 34.

The square root of 64742551 is about 8046.2755980640. The cubic root of 64742551 is about 401.5410366409.

It can be divided in two parts, 6474 and 2551, that added together give a square (9025 = 95²).

The spelling of 64742551 in words is "sixty-four million, seven hundred forty-two thousand, five hundred fifty-one".