64191437071044 has 192 divisors, whose sum is σ = 165549963075840. Its totient is φ = 19267463577600.

The previous prime is 64191437070919. The next prime is 64191437071121. The reversal of 64191437071044 is 44017073419146.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3811155687 + ... + 3811172529.

It is an arithmetic number, because the mean of its divisors is an integer number (862239391020).

Almost surely, 2^{64191437071044} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64191437071044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82774981537920).

64191437071044 is an abundant number, since it is smaller than the sum of its proper divisors (101358526004796).

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

64191437071044 is a wasteful number, since it uses less digits than its factorization.

64191437071044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22710 (or 22708 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 64191437071044 in words is "sixty-four trillion, one hundred ninety-one billion, four hundred thirty-seven million, seventy-one thousand, forty-four".