64547654521 has 8 divisors (see below), whose sum is σ = 73779422400. Its totient is φ = 55318555248.

The previous prime is 64547654519. The next prime is 64547654557. The reversal of 64547654521 is 12545674546.

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

It is a cyclic number.

It is not a de Polignac number, because 64547654521 - 2¹ = 64547654519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64547654321) 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, 615046 + ... + 712303.

It is an arithmetic number, because the mean of its divisors is an integer number (9222427800).

Almost surely, 2^64547654521 is an apocalyptic number.

It is an amenable number.

64547654521 is a deficient number, since it is larger than the sum of its proper divisors (9231767879).

64547654521 is a wasteful number, since it uses less digits than its factorization.

64547654521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334303.

The product of its digits is 4032000, while the sum is 49.

The spelling of 64547654521 in words is "sixty-four billion, five hundred forty-seven million, six hundred fifty-four thousand, five hundred twenty-one".