61910037517 has 2 divisors, whose sum is σ = 61910037518. Its totient is φ = 61910037516.

The previous prime is 61910037481. The next prime is 61910037529. The reversal of 61910037517 is 71573001916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32151717481 + 29758320036 = 179309^2 + 172506^2 .

It is a cyclic number.

It is not a de Polignac number, because 61910037517 - 2¹¹ = 61910035469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61910037517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61910037577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30955018758 + 30955018759.

It is an arithmetic number, because the mean of its divisors is an integer number (30955018759).

Almost surely, 2^61910037517 is an apocalyptic number.

It is an amenable number.

61910037517 is a deficient number, since it is larger than the sum of its proper divisors (1).

61910037517 is an equidigital number, since it uses as much as digits as its factorization.

61910037517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 40.

The spelling of 61910037517 in words is "sixty-one billion, nine hundred ten million, thirty-seven thousand, five hundred seventeen".