64212765278540 has 24 divisors (see below), whose sum is σ = 134846979640800. Its totient is φ = 25685073243648.

The previous prime is 64212765278539. The next prime is 64212765278549. The reversal of 64212765278540 is 4587256721246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64212765278540.

It is not an unprimeable number, because it can be changed into a prime (64212765278549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19463036 + ... + 22521884.

It is an arithmetic number, because the mean of its divisors is an integer number (5618624151700).

Almost surely, 2^{64212765278540} is an apocalyptic number.

It is an amenable number.

64212765278540 is an abundant number, since it is smaller than the sum of its proper divisors (70634214362260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64212765278540 is a wasteful number, since it uses less digits than its factorization.

64212765278540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108481 (or 4108479 counting only the distinct ones).

The product of its (nonzero) digits is 45158400, while the sum is 59.

The spelling of 64212765278540 in words is "sixty-four trillion, two hundred twelve billion, seven hundred sixty-five million, two hundred seventy-eight thousand, five hundred forty".