61539124469 has 2 divisors, whose sum is σ = 61539124470. Its totient is φ = 61539124468.

The previous prime is 61539124459. The next prime is 61539124487. The reversal of 61539124469 is 96442193516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41562976900 + 19976147569 = 203870^2 + 141337^2 .

It is a cyclic number.

It is not a de Polignac number, because 61539124469 - 2²⁴ = 61522347253 is a prime.

It is a super-2 number, since 2×61539124469² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61539124459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30769562234 + 30769562235.

It is an arithmetic number, because the mean of its divisors is an integer number (30769562235).

Almost surely, 2^61539124469 is an apocalyptic number.

It is an amenable number.

61539124469 is a deficient number, since it is larger than the sum of its proper divisors (1).

61539124469 is an equidigital number, since it uses as much as digits as its factorization.

61539124469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 50.

The spelling of 61539124469 in words is "sixty-one billion, five hundred thirty-nine million, one hundred twenty-four thousand, four hundred sixty-nine".