2661326063397 has 6 divisors (see below), whose sum is σ = 3844137647142. Its totient is φ = 1774217375592.

The previous prime is 2661326063353. The next prime is 2661326063399. The reversal of 2661326063397 is 7933606231662.

It is a happy number.

2661326063397 is a `hidden beast` number, since 2 + 6 + 6 + 132 + 60 + 63 + 397 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2558125143396 + 103200920001 = 1599414^2 + 321249^2 .

It is not a de Polignac number, because 2661326063397 - 2³⁵ = 2626966325029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661326063399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147851447958 + ... + 147851447975.

It is an arithmetic number, because the mean of its divisors is an integer number (640689607857).

Almost surely, 2^{2661326063397} is an apocalyptic number.

It is an amenable number.

2661326063397 is a deficient number, since it is larger than the sum of its proper divisors (1182811583745).

2661326063397 is a wasteful number, since it uses less digits than its factorization.

2661326063397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295702895939 (or 295702895936 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 54.

The spelling of 2661326063397 in words is "two trillion, six hundred sixty-one billion, three hundred twenty-six million, sixty-three thousand, three hundred ninety-seven".