665167787187 has 16 divisors (see below), whose sum is σ = 888334832640. Its totient is φ = 442723320000.

The previous prime is 665167787111. The next prime is 665167787189. The reversal of 665167787187 is 781787761566.

It is not a de Polignac number, because 665167787187 - 2¹⁶ = 665167721651 is a prime.

It is a super-2 number, since 2×665167787187² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665167787189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7868239 + ... + 7952327.

It is an arithmetic number, because the mean of its divisors is an integer number (55520927040).

Almost surely, 2^665167787187 is an apocalyptic number.

665167787187 is a deficient number, since it is larger than the sum of its proper divisors (223167045453).

665167787187 is a wasteful number, since it uses less digits than its factorization.

665167787187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88354.

The product of its digits is 165957120, while the sum is 69.

The spelling of 665167787187 in words is "six hundred sixty-five billion, one hundred sixty-seven million, seven hundred eighty-seven thousand, one hundred eighty-seven".