64720861523514 has 96 divisors (see below), whose sum is σ = 161023439850624. Its totient is φ = 18403881022080.

The previous prime is 64720861523489. The next prime is 64720861523519. The reversal of 64720861523514 is 41532516802746.

64720861523514 is a `hidden beast` number, since 6 + 4 + 7 + 2 + 0 + 8 + 61 + 523 + 51 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (64720861523519) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28169832 + ... + 30380604.

It is an arithmetic number, because the mean of its divisors is an integer number (1677327498444).

Almost surely, 2^{64720861523514} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64720861523514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80511719925312).

64720861523514 is an abundant number, since it is smaller than the sum of its proper divisors (96302578327110).

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

64720861523514 is a wasteful number, since it uses less digits than its factorization.

64720861523514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211892 (or 2211889 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 64720861523514 in words is "sixty-four trillion, seven hundred twenty billion, eight hundred sixty-one million, five hundred twenty-three thousand, five hundred fourteen".