64646261760 has 352 divisors, whose sum is σ = 226505626560. Its totient is φ = 15663628288.

The previous prime is 64646261749. The next prime is 64646261803. The reversal of 64646261760 is 6716264646.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 7568212 + ... + 7576748.

Almost surely, 2^64646261760 is an apocalyptic number.

64646261760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64646261760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113252813280).

64646261760 is an abundant number, since it is smaller than the sum of its proper divisors (161859364800).

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

64646261760 is a wasteful number, since it uses less digits than its factorization.

64646261760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8611 (or 8593 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 48.

The spelling of 64646261760 in words is "sixty-four billion, six hundred forty-six million, two hundred sixty-one thousand, seven hundred sixty".