64520647742 has 12 divisors (see below), whose sum is σ = 101171792400. Its totient is φ = 30857700588.

The previous prime is 64520647739. The next prime is 64520647747. The reversal of 64520647742 is 24774602546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64520647747) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30490742 + ... + 30492857.

It is an arithmetic number, because the mean of its divisors is an integer number (8430982700).

Almost surely, 2^64520647742 is an apocalyptic number.

64520647742 is a deficient number, since it is larger than the sum of its proper divisors (36651144658).

64520647742 is a wasteful number, since it uses less digits than its factorization.

64520647742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60983647 (or 60983624 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 47.

The spelling of 64520647742 in words is "sixty-four billion, five hundred twenty million, six hundred forty-seven thousand, seven hundred forty-two".