64487733778446 has 64 divisors (see below), whose sum is σ = 141654754872576. Its totient is φ = 19409305593600.

The previous prime is 64487733778427. The next prime is 64487733778453.

It is a happy number.

64487733778446 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24018861 + ... + 26568423.

It is an arithmetic number, because the mean of its divisors is an integer number (2213355544884).

Almost surely, 2^{64487733778446} is an apocalyptic number.

64487733778446 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64487733778446 is an abundant number, since it is smaller than the sum of its proper divisors (77167021094130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64487733778446 is a wasteful number, since it uses less digits than its factorization.

64487733778446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552177.

The product of its digits is 12745506816, while the sum is 78.

The spelling of 64487733778446 in words is "sixty-four trillion, four hundred eighty-seven billion, seven hundred thirty-three million, seven hundred seventy-eight thousand, four hundred forty-six".