64644464204642 has 32 divisors (see below), whose sum is σ = 110845583460480. Its totient is φ = 27698145747840.

The previous prime is 64644464204623. The next prime is 64644464204647. The reversal of 64644464204642 is 24640246444646.

It is not an unprimeable number, because it can be changed into a prime (64644464204647) 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, 1220117792 + ... + 1220170772.

It is an arithmetic number, because the mean of its divisors is an integer number (3463924483140).

Almost surely, 2^{64644464204642} is an apocalyptic number.

64644464204642 is a deficient number, since it is larger than the sum of its proper divisors (46201119255838).

64644464204642 is a wasteful number, since it uses less digits than its factorization.

64644464204642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72186.

The product of its (nonzero) digits is 84934656, while the sum is 56.

The spelling of 64644464204642 in words is "sixty-four trillion, six hundred forty-four billion, four hundred sixty-four million, two hundred four thousand, six hundred forty-two".