71663637903 has 32 divisors (see below), whose sum is σ = 113677347840. Its totient is φ = 39584039040.

The previous prime is 71663637863. The next prime is 71663637911. The reversal of 71663637903 is 30973636617.

It is not a de Polignac number, because 71663637903 - 2¹⁰ = 71663636879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71663637973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1023376 + ... + 1091157.

It is an arithmetic number, because the mean of its divisors is an integer number (3552417120).

Almost surely, 2^71663637903 is an apocalyptic number.

71663637903 is a deficient number, since it is larger than the sum of its proper divisors (42013709937).

71663637903 is a wasteful number, since it uses less digits than its factorization.

71663637903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114639.

The product of its (nonzero) digits is 2571912, while the sum is 51.

The spelling of 71663637903 in words is "seventy-one billion, six hundred sixty-three million, six hundred thirty-seven thousand, nine hundred three".