665197109380 has 24 divisors (see below), whose sum is σ = 1399192771032. Its totient is φ = 265644778752.

The previous prime is 665197109347. The next prime is 665197109383. The reversal of 665197109380 is 83901791566.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 94737146436 + 570459962944 = 307794^2 + 755288^2 .

It is a super-3 number, since 3×665197109380³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (665197109383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27116497 + ... + 27141016.

It is an arithmetic number, because the mean of its divisors is an integer number (58299698793).

Almost surely, 2^665197109380 is an apocalyptic number.

It is an amenable number.

665197109380 is an abundant number, since it is smaller than the sum of its proper divisors (733995661652).

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

665197109380 is a wasteful number, since it uses less digits than its factorization.

665197109380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54258135 (or 54258133 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 665197109380 in words is "six hundred sixty-five billion, one hundred ninety-seven million, one hundred nine thousand, three hundred eighty".