1665610515144 has 48 divisors (see below), whose sum is σ = 4565378235600. Its totient is φ = 548514304224.

The previous prime is 1665610515131. The next prime is 1665610515181. The reversal of 1665610515144 is 4415150165661.

It is a happy number.

1665610515144 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 610 + 5 + 15 + 14 + 4 = 666.

It is a super-2 number, since 2×1665610515144² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1665610515144.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 139352334 + ... + 139364285.

It is an arithmetic number, because the mean of its divisors is an integer number (95112046575).

Almost surely, 2^{1665610515144} is an apocalyptic number.

It is an amenable number.

1665610515144 is an abundant number, since it is smaller than the sum of its proper divisors (2899767720456).

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

1665610515144 is a wasteful number, since it uses less digits than its factorization.

1665610515144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278716714 (or 278716707 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 1665610515144 in words is "one trillion, six hundred sixty-five billion, six hundred ten million, five hundred fifteen thousand, one hundred forty-four".