61771499903 has 2 divisors, whose sum is σ = 61771499904. Its totient is φ = 61771499902.

The previous prime is 61771499821. The next prime is 61771499921. The reversal of 61771499903 is 30999417716.

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-61771499903 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61771499983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885749951 + 30885749952.

It is an arithmetic number, because the mean of its divisors is an integer number (30885749952).

Almost surely, 2^61771499903 is an apocalyptic number.

61771499903 is a deficient number, since it is larger than the sum of its proper divisors (1).

61771499903 is an equidigital number, since it uses as much as digits as its factorization.

61771499903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 56.

The spelling of 61771499903 in words is "sixty-one billion, seven hundred seventy-one million, four hundred ninety-nine thousand, nine hundred three".