71887198507 has 2 divisors, whose sum is σ = 71887198508. Its totient is φ = 71887198506.

The previous prime is 71887198451. The next prime is 71887198511. The reversal of 71887198507 is 70589178817.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71887198507 is a prime.

It is not a weakly prime, because it can be changed into another prime (71887198007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35943599253 + 35943599254.

It is an arithmetic number, because the mean of its divisors is an integer number (35943599254).

Almost surely, 2^71887198507 is an apocalyptic number.

71887198507 is a deficient number, since it is larger than the sum of its proper divisors (1).

71887198507 is an equidigital number, since it uses as much as digits as its factorization.

71887198507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7902720, while the sum is 61.

The spelling of 71887198507 in words is "seventy-one billion, eight hundred eighty-seven million, one hundred ninety-eight thousand, five hundred seven".