1665197015040 has 1440 divisors, whose sum is σ = 6820918917120. Its totient is φ = 385263599616.

The previous prime is 1665197015029. The next prime is 1665197015051. The reversal of 1665197015040 is 405107915661.

1665197015040 is a `hidden beast` number, since 1 + 6 + 6 + 51 + 97 + 0 + 1 + 504 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1665197015029) and next prime (1665197015051).

It is a tau number, because it is divible by the number of its divisors (1440).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 13111787457 + ... + 13111787583.

It is an arithmetic number, because the mean of its divisors is an integer number (4736749248).

Almost surely, 2^{1665197015040} is an apocalyptic number.

1665197015040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665197015040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3410459458560).

1665197015040 is an abundant number, since it is smaller than the sum of its proper divisors (5155721902080).

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

1665197015040 is an equidigital number, since it uses as much as digits as its factorization.

1665197015040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 1665197015040 in words is "one trillion, six hundred sixty-five billion, one hundred ninety-seven million, fifteen thousand, forty".