665578749360 has 80 divisors (see below), whose sum is σ = 2358050432256. Its totient is φ = 152132285184.

The previous prime is 665578749359. The next prime is 665578749361. The reversal of 665578749360 is 63947875566.

It is an interprime number because it is at equal distance from previous prime (665578749359) and next prime (665578749361).

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 665578749291 and 665578749300.

It is not an unprimeable number, because it can be changed into a prime (665578749361) 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, 198087234 + ... + 198090593.

Almost surely, 2^665578749360 is an apocalyptic number.

665578749360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665578749360 is an abundant number, since it is smaller than the sum of its proper divisors (1692471682896).

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

665578749360 is a wasteful number, since it uses less digits than its factorization.

665578749360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396177850 (or 396177844 counting only the distinct ones).

The product of its (nonzero) digits is 228614400, while the sum is 66.

The spelling of 665578749360 in words is "six hundred sixty-five billion, five hundred seventy-eight million, seven hundred forty-nine thousand, three hundred sixty".