1661650200523 has 16 divisors (see below), whose sum is σ = 1718208629280. Its totient is φ = 1605714230016.

The previous prime is 1661650200499. The next prime is 1661650200641. The reversal of 1661650200523 is 3250020561661.

It is a cyclic number.

It is not a de Polignac number, because 1661650200523 - 2⁵ = 1661650200491 is a prime.

It is a super-2 number, since 2×1661650200523² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661650200923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12965823 + ... + 13093351.

It is an arithmetic number, because the mean of its divisors is an integer number (107388039330).

Almost surely, 2^{1661650200523} is an apocalyptic number.

1661650200523 is a deficient number, since it is larger than the sum of its proper divisors (56558428757).

1661650200523 is a wasteful number, since it uses less digits than its factorization.

1661650200523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129966.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 1661650200523 in words is "one trillion, six hundred sixty-one billion, six hundred fifty million, two hundred thousand, five hundred twenty-three".