61209859663 has 2 divisors, whose sum is σ = 61209859664. Its totient is φ = 61209859662.

The previous prime is 61209859649. The next prime is 61209859699. The reversal of 61209859663 is 36695890216.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61209859663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61209854663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30604929831 + 30604929832.

It is an arithmetic number, because the mean of its divisors is an integer number (30604929832).

Almost surely, 2^61209859663 is an apocalyptic number.

61209859663 is a deficient number, since it is larger than the sum of its proper divisors (1).

61209859663 is an equidigital number, since it uses as much as digits as its factorization.

61209859663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 61209859663 in words is "sixty-one billion, two hundred nine million, eight hundred fifty-nine thousand, six hundred sixty-three".