665168088537 has 8 divisors (see below), whose sum is σ = 985434205280. Its totient is φ = 443445392340.

The previous prime is 665168088509. The next prime is 665168088547. The reversal of 665168088537 is 735880861566.

It is a happy number.

665168088537 is a `hidden beast` number, since 6 + 6 + 5 + 16 + 8 + 0 + 88 + 537 = 666.

It is not a de Polignac number, because 665168088537 - 2⁸ = 665168088281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665168088547) 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, 12317927539 + ... + 12317927592.

It is an arithmetic number, because the mean of its divisors is an integer number (123179275660).

Almost surely, 2^665168088537 is an apocalyptic number.

It is an amenable number.

665168088537 is a deficient number, since it is larger than the sum of its proper divisors (320266116743).

665168088537 is a wasteful number, since it uses less digits than its factorization.

665168088537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24635855140 (or 24635855134 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 63.

The spelling of 665168088537 in words is "six hundred sixty-five billion, one hundred sixty-eight million, eighty-eight thousand, five hundred thirty-seven".