61943061997 has 2 divisors, whose sum is σ = 61943061998. Its totient is φ = 61943061996.

The previous prime is 61943061989. The next prime is 61943062073. The reversal of 61943061997 is 79916034916.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57338218116 + 4604843881 = 239454^2 + 67859^2 .

It is a cyclic number.

It is not a de Polignac number, because 61943061997 - 2³ = 61943061989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61943061097) 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, 30971530998 + 30971530999.

It is an arithmetic number, because the mean of its divisors is an integer number (30971530999).

Almost surely, 2^61943061997 is an apocalyptic number.

It is an amenable number.

61943061997 is a deficient number, since it is larger than the sum of its proper divisors (1).

61943061997 is an equidigital number, since it uses as much as digits as its factorization.

61943061997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 55.

The spelling of 61943061997 in words is "sixty-one billion, nine hundred forty-three million, sixty-one thousand, nine hundred ninety-seven".