87991583623 has 2 divisors, whose sum is σ = 87991583624. Its totient is φ = 87991583622.

The previous prime is 87991583587. The next prime is 87991583711. The reversal of 87991583623 is 32638519978.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87991583623 - 2²⁵ = 87958029191 is a prime.

It is a super-2 number, since 2×87991583623² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87991584623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43995791811 + 43995791812.

It is an arithmetic number, because the mean of its divisors is an integer number (43995791812).

Almost surely, 2^87991583623 is an apocalyptic number.

87991583623 is a deficient number, since it is larger than the sum of its proper divisors (1).

87991583623 is an equidigital number, since it uses as much as digits as its factorization.

87991583623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 61.

The spelling of 87991583623 in words is "eighty-seven billion, nine hundred ninety-one million, five hundred eighty-three thousand, six hundred twenty-three".