61767430666637 has 2 divisors, whose sum is σ = 61767430666638. Its totient is φ = 61767430666636.

The previous prime is 61767430666583. The next prime is 61767430666639. The reversal of 61767430666637 is 73666603476716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39984198769636 + 21783231897001 = 6323306^2 + 4667251^2 .

It is a cyclic number.

It is not a de Polignac number, because 61767430666637 - 2²⁶ = 61767363557773 is a prime.

Together with 61767430666639, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61767430666639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30883715333318 + 30883715333319.

It is an arithmetic number, because the mean of its divisors is an integer number (30883715333319).

Almost surely, 2^{61767430666637} is an apocalyptic number.

It is an amenable number.

61767430666637 is a deficient number, since it is larger than the sum of its proper divisors (1).

61767430666637 is an equidigital number, since it uses as much as digits as its factorization.

61767430666637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576108288, while the sum is 68.

The spelling of 61767430666637 in words is "sixty-one trillion, seven hundred sixty-seven billion, four hundred thirty million, six hundred sixty-six thousand, six hundred thirty-seven".