665434357390 has 32 divisors (see below), whose sum is σ = 1306707155424. Its totient is φ = 241969453440.

The previous prime is 665434357351. The next prime is 665434357391. The reversal of 665434357390 is 93753434566.

It is a super-2 number, since 2×665434357390² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665434357391) 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, 5794812 + ... + 5908528.

It is an arithmetic number, because the mean of its divisors is an integer number (40834598607).

Almost surely, 2^665434357390 is an apocalyptic number.

665434357390 is a deficient number, since it is larger than the sum of its proper divisors (641272798034).

665434357390 is a wasteful number, since it uses less digits than its factorization.

665434357390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166932.

The product of its (nonzero) digits is 24494400, while the sum is 55.

The spelling of 665434357390 in words is "six hundred sixty-five billion, four hundred thirty-four million, three hundred fifty-seven thousand, three hundred ninety".