61897272487 has 2 divisors, whose sum is σ = 61897272488. Its totient is φ = 61897272486.

The previous prime is 61897272473. The next prime is 61897272491. The reversal of 61897272487 is 78427279816.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61897272487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61897272407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30948636243 + 30948636244.

It is an arithmetic number, because the mean of its divisors is an integer number (30948636244).

Almost surely, 2^61897272487 is an apocalyptic number.

61897272487 is a deficient number, since it is larger than the sum of its proper divisors (1).

61897272487 is an equidigital number, since it uses as much as digits as its factorization.

61897272487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 61.

The spelling of 61897272487 in words is "sixty-one billion, eight hundred ninety-seven million, two hundred seventy-two thousand, four hundred eighty-seven".