64751920765 has 16 divisors (see below), whose sum is σ = 88830392832. Its totient is φ = 44387437824.

The previous prime is 64751920759. The next prime is 64751920787. The reversal of 64751920765 is 56702915746.

It is a cyclic number.

It is not a de Polignac number, because 64751920765 - 2¹⁵ = 64751887997 is a prime.

It is a super-2 number, since 2×64751920765² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174949 + ... + 400138.

It is an arithmetic number, because the mean of its divisors is an integer number (5551899552).

Almost surely, 2^64751920765 is an apocalyptic number.

It is an amenable number.

64751920765 is a deficient number, since it is larger than the sum of its proper divisors (24078472067).

64751920765 is a wasteful number, since it uses less digits than its factorization.

64751920765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578316.

The product of its (nonzero) digits is 3175200, while the sum is 52.

The spelling of 64751920765 in words is "sixty-four billion, seven hundred fifty-one million, nine hundred twenty thousand, seven hundred sixty-five".