87791797507 has 2 divisors, whose sum is σ = 87791797508. Its totient is φ = 87791797506.

The previous prime is 87791797481. The next prime is 87791797517. The reversal of 87791797507 is 70579719778.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87791797507 - 2²³ = 87783408899 is a prime.

It is not a weakly prime, because it can be changed into another prime (87791797517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43895898753 + 43895898754.

It is an arithmetic number, because the mean of its divisors is an integer number (43895898754).

Almost surely, 2^87791797507 is an apocalyptic number.

87791797507 is a deficient number, since it is larger than the sum of its proper divisors (1).

87791797507 is an equidigital number, since it uses as much as digits as its factorization.

87791797507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54454680, while the sum is 67.

The spelling of 87791797507 in words is "eighty-seven billion, seven hundred ninety-one million, seven hundred ninety-seven thousand, five hundred seven".