61380853477 has 2 divisors, whose sum is σ = 61380853478. Its totient is φ = 61380853476.

The previous prime is 61380853393. The next prime is 61380853493. The reversal of 61380853477 is 77435808316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52936346241 + 8444507236 = 230079^2 + 91894^2 .

It is a cyclic number.

It is not a de Polignac number, because 61380853477 - 2⁷ = 61380853349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61380853277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30690426738 + 30690426739.

It is an arithmetic number, because the mean of its divisors is an integer number (30690426739).

Almost surely, 2^61380853477 is an apocalyptic number.

It is an amenable number.

61380853477 is a deficient number, since it is larger than the sum of its proper divisors (1).

61380853477 is an equidigital number, since it uses as much as digits as its factorization.

61380853477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 61380853477 in words is "sixty-one billion, three hundred eighty million, eight hundred fifty-three thousand, four hundred seventy-seven".