64545019326890 has 16 divisors (see below), whose sum is σ = 116679665843208. Its totient is φ = 25707200829696.

The previous prime is 64545019326883. The next prime is 64545019326901. The reversal of 64545019326890 is 9862391054546.

It can be written as a sum of positive squares in 4 ways, for example, as 59027213628889 + 5517805698001 = 7682917^2 + 2349001^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13850860187 + ... + 13850864846.

Almost surely, 2^{64545019326890} is an apocalyptic number.

64545019326890 is a deficient number, since it is larger than the sum of its proper divisors (52134646516318).

64545019326890 is a wasteful number, since it uses less digits than its factorization.

64545019326890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27701725273.

The product of its (nonzero) digits is 55987200, while the sum is 62.

The spelling of 64545019326890 in words is "sixty-four trillion, five hundred forty-five billion, nineteen million, three hundred twenty-six thousand, eight hundred ninety".