64578405749 has 16 divisors (see below), whose sum is σ = 78315707904. Its totient is φ = 52443547200.

The previous prime is 64578405737. The next prime is 64578405757. The reversal of 64578405749 is 94750487546.

It is a de Polignac number, because none of the positive numbers 2^k-64578405749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64578405709) 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 in 15 ways as a sum of consecutive naturals, for example, 7279394 + ... + 7288259.

It is an arithmetic number, because the mean of its divisors is an integer number (4894731744).

Almost surely, 2^64578405749 is an apocalyptic number.

It is an amenable number.

64578405749 is a deficient number, since it is larger than the sum of its proper divisors (13737302155).

64578405749 is a wasteful number, since it uses less digits than its factorization.

64578405749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14567708.

The product of its (nonzero) digits is 33868800, while the sum is 59.

The spelling of 64578405749 in words is "sixty-four billion, five hundred seventy-eight million, four hundred five thousand, seven hundred forty-nine".