64777487493 has 8 divisors (see below), whose sum is σ = 90915772000. Its totient is φ = 40912097328.

The previous prime is 64777487491. The next prime is 64777487519. The reversal of 64777487493 is 39478477746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64777487493 - 2¹ = 64777487491 is a prime.

It is a super-2 number, since 2×64777487493² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64777487491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568223518 + ... + 568223631.

It is an arithmetic number, because the mean of its divisors is an integer number (11364471500).

Almost surely, 2^64777487493 is an apocalyptic number.

It is an amenable number.

64777487493 is a deficient number, since it is larger than the sum of its proper divisors (26138284507).

64777487493 is a wasteful number, since it uses less digits than its factorization.

64777487493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136447171.

The product of its digits is 199148544, while the sum is 66.

The spelling of 64777487493 in words is "sixty-four billion, seven hundred seventy-seven million, four hundred eighty-seven thousand, four hundred ninety-three".