61420043497 has 2 divisors, whose sum is σ = 61420043498. Its totient is φ = 61420043496.

The previous prime is 61420043491. The next prime is 61420043519. The reversal of 61420043497 is 79434002416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50561569881 + 10858473616 = 224859^2 + 104204^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61420043497 is a prime.

It is not a weakly prime, because it can be changed into another prime (61420043491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30710021748 + 30710021749.

It is an arithmetic number, because the mean of its divisors is an integer number (30710021749).

Almost surely, 2^61420043497 is an apocalyptic number.

It is an amenable number.

61420043497 is a deficient number, since it is larger than the sum of its proper divisors (1).

61420043497 is an equidigital number, since it uses as much as digits as its factorization.

61420043497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 61420043497 in words is "sixty-one billion, four hundred twenty million, forty-three thousand, four hundred ninety-seven".