61897272473 has 2 divisors, whose sum is σ = 61897272474. Its totient is φ = 61897272472.

The previous prime is 61897272469. The next prime is 61897272487. The reversal of 61897272473 is 37427279816.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45448696969 + 16448575504 = 213187^2 + 128252^2 .

It is a cyclic number.

It is not a de Polignac number, because 61897272473 - 2² = 61897272469 is a prime.

It is not a weakly prime, because it can be changed into another prime (61897272403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30948636236 + 30948636237.

It is an arithmetic number, because the mean of its divisors is an integer number (30948636237).

Almost surely, 2^61897272473 is an apocalyptic number.

It is an amenable number.

61897272473 is a deficient number, since it is larger than the sum of its proper divisors (1).

61897272473 is an equidigital number, since it uses as much as digits as its factorization.

61897272473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7112448, while the sum is 56.

The spelling of 61897272473 in words is "sixty-one billion, eight hundred ninety-seven million, two hundred seventy-two thousand, four hundred seventy-three".