1616522501666 has 16 divisors (see below), whose sum is σ = 2440790858880. Its totient is φ = 802938002160.

The previous prime is 1616522501663. The next prime is 1616522501669. The reversal of 1616522501666 is 6661052256161.

It is an interprime number because it is at equal distance from previous prime (1616522501663) and next prime (1616522501669).

It is a super-3 number, since 3×1616522501666³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1616522501666.

It is not an unprimeable number, because it can be changed into a prime (1616522501663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2853290 + ... + 3372581.

It is an arithmetic number, because the mean of its divisors is an integer number (152549428680).

Almost surely, 2^{1616522501666} is an apocalyptic number.

1616522501666 is a deficient number, since it is larger than the sum of its proper divisors (824268357214).

1616522501666 is a wasteful number, since it uses less digits than its factorization.

1616522501666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226729.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 1616522501666 in words is "one trillion, six hundred sixteen billion, five hundred twenty-two million, five hundred one thousand, six hundred sixty-six".