64777070660 has 12 divisors (see below), whose sum is σ = 136031848428. Its totient is φ = 25910828256.

The previous prime is 64777070573. The next prime is 64777070663. The reversal of 64777070660 is 6607077746.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20552663044 + 44224407616 = 143362^2 + 210296^2 .

It is a super-3 number, since 3×64777070660³ (a number of 33 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64777070599 and 64777070608.

It is not an unprimeable number, because it can be changed into a prime (64777070663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619426747 + ... + 1619426786.

It is an arithmetic number, because the mean of its divisors is an integer number (11335987369).

Almost surely, 2^64777070660 is an apocalyptic number.

It is an amenable number.

64777070660 is an abundant number, since it is smaller than the sum of its proper divisors (71254777768).

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

64777070660 is a wasteful number, since it uses less digits than its factorization.

64777070660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238853542 (or 3238853540 counting only the distinct ones).

The product of its (nonzero) digits is 2074464, while the sum is 50.

The spelling of 64777070660 in words is "sixty-four billion, seven hundred seventy-seven million, seventy thousand, six hundred sixty".