64720441670144 has 160 divisors (see below), whose sum is σ = 150327529672320. Its totient is φ = 27586983739392.

The previous prime is 64720441670119. The next prime is 64720441670219. The reversal of 64720441670144 is 44107614402746.

It is a super-2 number, since 2×64720441670144² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64720441670092 and 64720441670101.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2849522 + ... + 11728625.

It is an arithmetic number, because the mean of its divisors is an integer number (939547060452).

Almost surely, 2^{64720441670144} is an apocalyptic number.

64720441670144 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

64720441670144 is an abundant number, since it is smaller than the sum of its proper divisors (85607088002176).

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

64720441670144 is a wasteful number, since it uses less digits than its factorization.

64720441670144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14578230 (or 14578214 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 50.

The spelling of 64720441670144 in words is "sixty-four trillion, seven hundred twenty billion, four hundred forty-one million, six hundred seventy thousand, one hundred forty-four".