866761067521386 has 48 divisors (see below), whose sum is σ = 1878589471374720. Its totient is φ = 288826949810880.

The previous prime is 866761067521381. The next prime is 866761067521387. The reversal of 866761067521386 is 683125760167668.

It is a happy number.

866761067521386 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 6 + 1 + 0 + 67 + 521 + 38 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (866761067521381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7010809791 + ... + 7010933421.

It is an arithmetic number, because the mean of its divisors is an integer number (39137280653640).

Almost surely, 2^{866761067521386} is an apocalyptic number.

866761067521386 is an abundant number, since it is smaller than the sum of its proper divisors (1011828403853334).

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

866761067521386 is a wasteful number, since it uses less digits than its factorization.

866761067521386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246411 (or 246408 counting only the distinct ones).

The product of its (nonzero) digits is 731566080, while the sum is 72.

The spelling of 866761067521386 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, sixty-seven million, five hundred twenty-one thousand, three hundred eighty-six".