61498417661 has 2 divisors, whose sum is σ = 61498417662. Its totient is φ = 61498417660.

The previous prime is 61498417627. The next prime is 61498417663. The reversal of 61498417661 is 16671489416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52989277636 + 8509140025 = 230194^2 + 92245^2 .

It is a cyclic number.

It is not a de Polignac number, because 61498417661 - 2⁶ = 61498417597 is a prime.

It is a Sophie Germain prime.

Together with 61498417663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61498417663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30749208830 + 30749208831.

It is an arithmetic number, because the mean of its divisors is an integer number (30749208831).

Almost surely, 2^61498417661 is an apocalyptic number.

It is an amenable number.

61498417661 is a deficient number, since it is larger than the sum of its proper divisors (1).

61498417661 is an equidigital number, since it uses as much as digits as its factorization.

61498417661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The spelling of 61498417661 in words is "sixty-one billion, four hundred ninety-eight million, four hundred seventeen thousand, six hundred sixty-one".