64051562640 has 320 divisors, whose sum is σ = 221297836032. Its totient is φ = 15218841600.

The previous prime is 64051562629. The next prime is 64051562669. The reversal of 64051562640 is 4626515046.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58708495 + ... + 58709585.

Almost surely, 2^64051562640 is an apocalyptic number.

64051562640 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 64051562640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110648918016).

64051562640 is an abundant number, since it is smaller than the sum of its proper divisors (157246273392).

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

64051562640 is a wasteful number, since it uses less digits than its factorization.

64051562640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758 (or 1752 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 64051562640 in words is "sixty-four billion, fifty-one million, five hundred sixty-two thousand, six hundred forty".