1665155412240 has 80 divisors (see below), whose sum is σ = 5287883803776. Its totient is φ = 433211161600.

The previous prime is 1665155412229. The next prime is 1665155412257. The reversal of 1665155412240 is 422145515661.

It is a happy number.

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 = 1665155412192 and 1665155412201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84601716 + ... + 84621395.

Almost surely, 2^{1665155412240} is an apocalyptic number.

1665155412240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665155412240 is an abundant number, since it is smaller than the sum of its proper divisors (3622728391536).

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

1665155412240 is a wasteful number, since it uses less digits than its factorization.

1665155412240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169223168 (or 169223162 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

It can be divided in two parts, 166515 and 5412240, that added together give a palindrome (5578755).

The spelling of 1665155412240 in words is "one trillion, six hundred sixty-five billion, one hundred fifty-five million, four hundred twelve thousand, two hundred forty".