64746655680 has 896 divisors, whose sum is σ = 257495040000. Its totient is φ = 13737185280.

The previous prime is 64746655667. The next prime is 64746655691. The reversal of 64746655680 is 8655664746.

64746655680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 64746655680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 494249215 + ... + 494249345.

Almost surely, 2^64746655680 is an apocalyptic number.

64746655680 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 64746655680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128747520000).

64746655680 is an abundant number, since it is smaller than the sum of its proper divisors (192748384320).

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

64746655680 is a wasteful number, since it uses less digits than its factorization.

64746655680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 57.

The spelling of 64746655680 in words is "sixty-four billion, seven hundred forty-six million, six hundred fifty-five thousand, six hundred eighty".