64157777730 has 80 divisors (see below), whose sum is σ = 172597674744. Its totient is φ = 17100357120.

The previous prime is 64157777729. The next prime is 64157777771. The reversal of 64157777730 is 3777775146.

64157777730 is a `hidden beast` number, since 64 + 1 + 577 + 7 + 7 + 7 + 3 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 52048315881 + 12109461849 = 228141^2 + 110043^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1732084 + ... + 1768736.

Almost surely, 2^64157777730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64157777730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86298837372).

64157777730 is an abundant number, since it is smaller than the sum of its proper divisors (108439897014).

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

64157777730 is a wasteful number, since it uses less digits than its factorization.

64157777730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38833 (or 38824 counting only the distinct ones).

The product of its (nonzero) digits is 6050520, while the sum is 54.

The spelling of 64157777730 in words is "sixty-four billion, one hundred fifty-seven million, seven hundred seventy-seven thousand, seven hundred thirty".