64157686720 has 112 divisors (see below), whose sum is σ = 160398927360. Its totient is φ = 24396235776.

The previous prime is 64157686717. The next prime is 64157686727. The reversal of 64157686720 is 2768675146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64157686727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1172941 + ... + 1226419.

It is an arithmetic number, because the mean of its divisors is an integer number (1432133280).

Almost surely, 2^64157686720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64157686720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80199463680).

64157686720 is an abundant number, since it is smaller than the sum of its proper divisors (96241240640).

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

64157686720 is a wasteful number, since it uses less digits than its factorization.

64157686720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53682 (or 53672 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 64157686720 in words is "sixty-four billion, one hundred fifty-seven million, six hundred eighty-six thousand, seven hundred twenty".