1665625577616 has 800 divisors, whose sum is σ = 6569637516288. Its totient is φ = 393369799680.

The previous prime is 1665625577591. The next prime is 1665625577641. The reversal of 1665625577616 is 6167755265661.

1665625577616 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 6 + 2 + 5 + 5 + 7 + 7 + 616 = 666.

It is an interprime number because it is at equal distance from previous prime (1665625577591) and next prime (1665625577641).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 86909251 + ... + 86928413.

Almost surely, 2^{1665625577616} is an apocalyptic number.

1665625577616 is a gapful number since it is divisible by the number (16) 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 1665625577616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3284818758144).

1665625577616 is an abundant number, since it is smaller than the sum of its proper divisors (4904011938672).

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

1665625577616 is a wasteful number, since it uses less digits than its factorization.

1665625577616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19281 (or 19266 counting only the distinct ones).

The product of its digits is 95256000, while the sum is 63.

The spelling of 1665625577616 in words is "one trillion, six hundred sixty-five billion, six hundred twenty-five million, five hundred seventy-seven thousand, six hundred sixteen".