64766767650 has 96 divisors (see below), whose sum is σ = 173260660608. Its totient is φ = 15916454400.

The previous prime is 64766767649. The next prime is 64766767669. The reversal of 64766767650 is 5676766746.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1176235 + ... + 1230065.

It is an arithmetic number, because the mean of its divisors is an integer number (1804798548).

Almost surely, 2^64766767650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64766767650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86630330304).

64766767650 is an abundant number, since it is smaller than the sum of its proper divisors (108493892958).

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

64766767650 is a wasteful number, since it uses less digits than its factorization.

64766767650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54476 (or 54471 counting only the distinct ones).

The product of its (nonzero) digits is 53343360, while the sum is 60.

The spelling of 64766767650 in words is "sixty-four billion, seven hundred sixty-six million, seven hundred sixty-seven thousand, six hundred fifty".