64872217251 has 12 divisors (see below), whose sum is σ = 97174844312. Its totient is φ = 43248144672.

The previous prime is 64872217217. The next prime is 64872217259. The reversal of 64872217251 is 15271227846.

It is not a de Polignac number, because 64872217251 - 2¹⁵ = 64872184483 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64872217197 and 64872217206.

It is not an unprimeable number, because it can be changed into a prime (64872217259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133481686 + ... + 133482171.

Almost surely, 2^64872217251 is an apocalyptic number.

64872217251 is a deficient number, since it is larger than the sum of its proper divisors (32302627061).

64872217251 is an equidigital number, since it uses as much as digits as its factorization.

64872217251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266963872 (or 266963860 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The spelling of 64872217251 in words is "sixty-four billion, eight hundred seventy-two million, two hundred seventeen thousand, two hundred fifty-one".