161526552506 has 24 divisors (see below), whose sum is σ = 271343472372. Its totient is φ = 72035849600.

The previous prime is 161526552503. The next prime is 161526552553. The reversal of 161526552506 is 605255625161.

It can be written as a sum of positive squares in 2 ways, for example, as 159273626281 + 2252926225 = 399091^2 + 47465^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161526552503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6284015 + ... + 6309666.

Almost surely, 2^161526552506 is an apocalyptic number.

161526552506 is a deficient number, since it is larger than the sum of its proper divisors (109816919866).

161526552506 is a wasteful number, since it uses less digits than its factorization.

161526552506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12593758 (or 12593747 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 44.

It can be divided in two parts, 16152655 and 2506, that added together give a palindrome (16155161).

The spelling of 161526552506 in words is "one hundred sixty-one billion, five hundred twenty-six million, five hundred fifty-two thousand, five hundred six".