61143230664 has 48 divisors (see below), whose sum is σ = 165744718620. Its totient is φ = 20362803840.

The previous prime is 61143230657. The next prime is 61143230677. The reversal of 61143230664 is 46603234116.

61143230664 is a `hidden beast` number, since 611 + 4 + 3 + 2 + 30 + 6 + 6 + 4 = 666.

61143230664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 54685822500 + 6457408164 = 233850^2 + 80358^2 .

It is a super-2 number, since 2×61143230664² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299707 + ... + 460554.

Almost surely, 2^61143230664 is an apocalyptic number.

It is an amenable number.

61143230664 is an abundant number, since it is smaller than the sum of its proper divisors (104601487956).

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

61143230664 is a wasteful number, since it uses less digits than its factorization.

61143230664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761390 (or 761383 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 61143230664 in words is "sixty-one billion, one hundred forty-three million, two hundred thirty thousand, six hundred sixty-four".