61215851197 has 2 divisors, whose sum is σ = 61215851198. Its totient is φ = 61215851196.

The previous prime is 61215851189. The next prime is 61215851231. The reversal of 61215851197 is 79115851216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58871257956 + 2344593241 = 242634^2 + 48421^2 .

It is a cyclic number.

It is not a de Polignac number, because 61215851197 - 2³ = 61215851189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61215851107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30607925598 + 30607925599.

It is an arithmetic number, because the mean of its divisors is an integer number (30607925599).

Almost surely, 2^61215851197 is an apocalyptic number.

It is an amenable number.

61215851197 is a deficient number, since it is larger than the sum of its proper divisors (1).

61215851197 is an equidigital number, since it uses as much as digits as its factorization.

61215851197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 46.

The spelling of 61215851197 in words is "sixty-one billion, two hundred fifteen million, eight hundred fifty-one thousand, one hundred ninety-seven".