61366571397 has 24 divisors (see below), whose sum is σ = 91026973440. Its totient is φ = 39824235360.

The previous prime is 61366571369. The next prime is 61366571417. The reversal of 61366571397 is 79317566316.

61366571397 is a `hidden beast` number, since 6 + 1 + 3 + 66 + 571 + 3 + 9 + 7 = 666.

61366571397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61366571397 - 2⁷ = 61366571269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61366571197) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 557338 + ... + 658299.

It is an arithmetic number, because the mean of its divisors is an integer number (3792790560).

Almost surely, 2^61366571397 is an apocalyptic number.

It is an amenable number.

61366571397 is a deficient number, since it is larger than the sum of its proper divisors (29660402043).

61366571397 is a wasteful number, since it uses less digits than its factorization.

61366571397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215793 (or 1215790 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 54.

The spelling of 61366571397 in words is "sixty-one billion, three hundred sixty-six million, five hundred seventy-one thousand, three hundred ninety-seven".