61398366399 has 6 divisors (see below), whose sum is σ = 88686529256. Its totient is φ = 40932244260.

The previous prime is 61398366397. The next prime is 61398366413. The reversal of 61398366399 is 99366389316.

61398366399 is a `hidden beast` number, since 613 + 9 + 8 + 3 + 6 + 6 + 3 + 9 + 9 = 666.

It is not a de Polignac number, because 61398366399 - 2¹ = 61398366397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61398366397) 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, 3411020347 + ... + 3411020364.

Almost surely, 2^61398366399 is an apocalyptic number.

61398366399 is a deficient number, since it is larger than the sum of its proper divisors (27288162857).

61398366399 is a wasteful number, since it uses less digits than its factorization.

61398366399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822040717 (or 6822040714 counting only the distinct ones).

The product of its digits is 34012224, while the sum is 63.

The spelling of 61398366399 in words is "sixty-one billion, three hundred ninety-eight million, three hundred sixty-six thousand, three hundred ninety-nine".