64505621471 has 8 divisors (see below), whose sum is σ = 67916674800. Its totient is φ = 61096170240.

The previous prime is 64505621461. The next prime is 64505621483. The reversal of 64505621471 is 17412650546.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64505621471 is a prime.

It is a super-3 number, since 3×64505621471³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64505621461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317426 + ... + 479343.

It is an arithmetic number, because the mean of its divisors is an integer number (8489584350).

Almost surely, 2^64505621471 is an apocalyptic number.

64505621471 is a deficient number, since it is larger than the sum of its proper divisors (3411053329).

64505621471 is a wasteful number, since it uses less digits than its factorization.

64505621471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801049.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 64505621471 in words is "sixty-four billion, five hundred five million, six hundred twenty-one thousand, four hundred seventy-one".