64621009459 has 18 divisors (see below), whose sum is σ = 70483636860. Its totient is φ = 59079479760.

The previous prime is 64621009429. The next prime is 64621009487. The reversal of 64621009459 is 95490012646.

It is not a de Polignac number, because 64621009459 - 2²¹ = 64618912307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64621009429) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 32132764 + ... + 32134774.

Almost surely, 2^64621009459 is an apocalyptic number.

64621009459 is a deficient number, since it is larger than the sum of its proper divisors (5862627401).

64621009459 is an frugal number, since it uses more digits than its factorization.

64621009459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099 (or 2059 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 64621009459 in words is "sixty-four billion, six hundred twenty-one million, nine thousand, four hundred fifty-nine".