61371665287 has 2 divisors, whose sum is σ = 61371665288. Its totient is φ = 61371665286.

The previous prime is 61371665281. The next prime is 61371665291. The reversal of 61371665287 is 78256617316.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61371665287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61371665281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30685832643 + 30685832644.

It is an arithmetic number, because the mean of its divisors is an integer number (30685832644).

Almost surely, 2^61371665287 is an apocalyptic number.

61371665287 is a deficient number, since it is larger than the sum of its proper divisors (1).

61371665287 is an equidigital number, since it uses as much as digits as its factorization.

61371665287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The spelling of 61371665287 in words is "sixty-one billion, three hundred seventy-one million, six hundred sixty-five thousand, two hundred eighty-seven".