66144780570 has 32 divisors (see below), whose sum is σ = 173179062720. Its totient is φ = 16035098240.

The previous prime is 66144780557. The next prime is 66144780589. The reversal of 66144780570 is 7508744166.

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, 100219035 + ... + 100219694.

It is an arithmetic number, because the mean of its divisors is an integer number (5411845710).

Almost surely, 2^66144780570 is an apocalyptic number.

66144780570 is an abundant number, since it is smaller than the sum of its proper divisors (107034282150).

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

66144780570 is a wasteful number, since it uses less digits than its factorization.

66144780570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200438750.

The product of its (nonzero) digits is 1128960, while the sum is 48.

It can be divided in two parts, 66 and 144780570, that added together give a triangular number (144780636 = T₁₇₀₁₆).

The spelling of 66144780570 in words is "sixty-six billion, one hundred forty-four million, seven hundred eighty thousand, five hundred seventy".