97577781493 has 2 divisors, whose sum is σ = 97577781494. Its totient is φ = 97577781492.

The previous prime is 97577781479. The next prime is 97577781527. The reversal of 97577781493 is 39418777579.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66841380369 + 30736401124 = 258537^2 + 175318^2 .

It is a cyclic number.

It is not a de Polignac number, because 97577781493 - 2²⁵ = 97544227061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97577781293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48788890746 + 48788890747.

It is an arithmetic number, because the mean of its divisors is an integer number (48788890747).

Almost surely, 2^97577781493 is an apocalyptic number.

It is an amenable number.

97577781493 is a deficient number, since it is larger than the sum of its proper divisors (1).

97577781493 is an equidigital number, since it uses as much as digits as its factorization.

97577781493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93350880, while the sum is 67.

The spelling of 97577781493 in words is "ninety-seven billion, five hundred seventy-seven million, seven hundred eighty-one thousand, four hundred ninety-three".