61543354757 has 2 divisors, whose sum is σ = 61543354758. Its totient is φ = 61543354756.

The previous prime is 61543354739. The next prime is 61543354777. The reversal of 61543354757 is 75745334516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41420797441 + 20122557316 = 203521^2 + 141854^2 .

It is a cyclic number.

It is not a de Polignac number, because 61543354757 - 2¹⁶ = 61543289221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61543354777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30771677378 + 30771677379.

It is an arithmetic number, because the mean of its divisors is an integer number (30771677379).

Almost surely, 2^61543354757 is an apocalyptic number.

It is an amenable number.

61543354757 is a deficient number, since it is larger than the sum of its proper divisors (1).

61543354757 is an equidigital number, since it uses as much as digits as its factorization.

61543354757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292000, while the sum is 50.

The spelling of 61543354757 in words is "sixty-one billion, five hundred forty-three million, three hundred fifty-four thousand, seven hundred fifty-seven".