161423501587 has 2 divisors, whose sum is σ = 161423501588. Its totient is φ = 161423501586.

The previous prime is 161423501567. The next prime is 161423501621. The reversal of 161423501587 is 785105324161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161423501587 is a prime.

It is not a weakly prime, because it can be changed into another prime (161423501567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80711750793 + 80711750794.

It is an arithmetic number, because the mean of its divisors is an integer number (80711750794).

Almost surely, 2^161423501587 is an apocalyptic number.

161423501587 is a deficient number, since it is larger than the sum of its proper divisors (1).

161423501587 is an equidigital number, since it uses as much as digits as its factorization.

161423501587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 161423501587 in words is "one hundred sixty-one billion, four hundred twenty-three million, five hundred one thousand, five hundred eighty-seven".