102551611661 has 16 divisors (see below), whose sum is σ = 105515574528. Its totient is φ = 99610560000.

The previous prime is 102551611619. The next prime is 102551611667. The reversal of 102551611661 is 166116155201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 102551611661 - 2²⁶ = 102484502797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102551611667) 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, 10371626 + ... + 10381508.

It is an arithmetic number, because the mean of its divisors is an integer number (6594723408).

Almost surely, 2^102551611661 is an apocalyptic number.

It is an amenable number.

102551611661 is a deficient number, since it is larger than the sum of its proper divisors (2963962867).

102551611661 is an equidigital number, since it uses as much as digits as its factorization.

102551611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11012.

The product of its (nonzero) digits is 10800, while the sum is 35.

Adding to 102551611661 its reverse (166116155201), we get a palindrome (268667766862).

The spelling of 102551611661 in words is "one hundred two billion, five hundred fifty-one million, six hundred eleven thousand, six hundred sixty-one".