64542006561 has 16 divisors (see below), whose sum is σ = 86909277888. Its totient is φ = 42601824000.

The previous prime is 64542006559. The next prime is 64542006583. The reversal of 64542006561 is 16560024546.

It is not a de Polignac number, because 64542006561 - 2¹ = 64542006559 is a prime.

It is a super-2 number, since 2×64542006561² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64542006961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522301 + ... + 633941.

It is an arithmetic number, because the mean of its divisors is an integer number (5431829868).

Almost surely, 2^64542006561 is an apocalyptic number.

It is an amenable number.

64542006561 is a deficient number, since it is larger than the sum of its proper divisors (22367271327).

64542006561 is a wasteful number, since it uses less digits than its factorization.

64542006561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113552.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 64542006561 in words is "sixty-four billion, five hundred forty-two million, six thousand, five hundred sixty-one".