64186180421 has 24 divisors (see below), whose sum is σ = 72573822720. Its totient is φ = 56683709280.

The previous prime is 64186180391. The next prime is 64186180423. The reversal of 64186180421 is 12408168146.

It is a happy number.

It is not a de Polignac number, because 64186180421 - 2¹⁴ = 64186164037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64186180423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2885540 + ... + 2907698.

It is an arithmetic number, because the mean of its divisors is an integer number (3023909280).

Almost surely, 2^64186180421 is an apocalyptic number.

It is an amenable number.

64186180421 is a deficient number, since it is larger than the sum of its proper divisors (8387642299).

64186180421 is a wasteful number, since it uses less digits than its factorization.

64186180421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22865 (or 22854 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The spelling of 64186180421 in words is "sixty-four billion, one hundred eighty-six million, one hundred eighty thousand, four hundred twenty-one".