665354091 has 8 divisors (see below), whose sum is σ = 911115664. Its totient is φ = 431580960.

The previous prime is 665354087. The next prime is 665354099. The reversal of 665354091 is 190453566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665354091 - 2² = 665354087 is a prime.

It is a super-4 number, since 4×665354091⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665354099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2996980 + ... + 2997201.

It is an arithmetic number, because the mean of its divisors is an integer number (113889458).

Almost surely, 2^665354091 is an apocalyptic number.

665354091 is a deficient number, since it is larger than the sum of its proper divisors (245761573).

665354091 is a wasteful number, since it uses less digits than its factorization.

665354091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5994221.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 665354091 is about 25794.4585327934. The cubic root of 665354091 is about 873.0067678307.

The spelling of 665354091 in words is "six hundred sixty-five million, three hundred fifty-four thousand, ninety-one".