64785551 has 2 divisors, whose sum is σ = 64785552. Its totient is φ = 64785550.

The previous prime is 64785547. The next prime is 64785569. The reversal of 64785551 is 15558746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64785551 - 2² = 64785547 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64785499 and 64785508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64785571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32392775 + 32392776.

It is an arithmetic number, because the mean of its divisors is an integer number (32392776).

Almost surely, 2^64785551 is an apocalyptic number.

64785551 is a deficient number, since it is larger than the sum of its proper divisors (1).

64785551 is an equidigital number, since it uses as much as digits as its factorization.

64785551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168000, while the sum is 41.

The square root of 64785551 is about 8048.9471982365. The cubic root of 64785551 is about 401.6299140131.

The spelling of 64785551 in words is "sixty-four million, seven hundred eighty-five thousand, five hundred fifty-one".