61693599197 has 4 divisors (see below), whose sum is σ = 61768744476. Its totient is φ = 61618453920.

The previous prime is 61693599179. The next prime is 61693599221. The reversal of 61693599197 is 79199539616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12855251161 + 48838348036 = 113381^2 + 220994^2 .

It is a cyclic number.

It is not a de Polignac number, because 61693599197 - 2²⁴ = 61676821981 is a prime.

It is a super-2 number, since 2×61693599197² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61693509197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37571408 + ... + 37573049.

It is an arithmetic number, because the mean of its divisors is an integer number (15442186119).

Almost surely, 2^61693599197 is an apocalyptic number.

It is an amenable number.

61693599197 is a deficient number, since it is larger than the sum of its proper divisors (75145279).

61693599197 is an equidigital number, since it uses as much as digits as its factorization.

61693599197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75145278.

The product of its digits is 24800580, while the sum is 65.

The spelling of 61693599197 in words is "sixty-one billion, six hundred ninety-three million, five hundred ninety-nine thousand, one hundred ninety-seven".