64191436541240 has 32 divisors (see below), whose sum is σ = 144467548969680. Its totient is φ = 25670029416192.

The previous prime is 64191436541161. The next prime is 64191436541257. The reversal of 64191436541240 is 4214563419146.

It is a congruent number.

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, 204378629 + ... + 204692468.

Almost surely, 2^{64191436541240} is an apocalyptic number.

It is an amenable number.

64191436541240 is an abundant number, since it is smaller than the sum of its proper divisors (80276112428440).

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

64191436541240 is a wasteful number, since it uses less digits than its factorization.

64191436541240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409075031 (or 409075027 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 64191436541240 in words is "sixty-four trillion, one hundred ninety-one billion, four hundred thirty-six million, five hundred forty-one thousand, two hundred forty".