64434431455 has 8 divisors (see below), whose sum is σ = 78588880704. Its totient is φ = 50702503200.

The previous prime is 64434431449. The next prime is 64434431491. The reversal of 64434431455 is 55413443446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64434431455 - 2⁹ = 64434430943 is a prime.

It is a Duffinian number.

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, 105629911 + ... + 105630520.

It is an arithmetic number, because the mean of its divisors is an integer number (9823610088).

Almost surely, 2^64434431455 is an apocalyptic number.

64434431455 is a deficient number, since it is larger than the sum of its proper divisors (14154449249).

64434431455 is a wasteful number, since it uses less digits than its factorization.

64434431455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211260497.

The product of its digits is 1382400, while the sum is 43.

The spelling of 64434431455 in words is "sixty-four billion, four hundred thirty-four million, four hundred thirty-one thousand, four hundred fifty-five".