27121612151506 has 4 divisors (see below), whose sum is σ = 40682418227262. Its totient is φ = 13560806075752.

The previous prime is 27121612151497. The next prime is 27121612151537. The reversal of 27121612151506 is 60515121612172.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18358182776025 + 8763429375481 = 4284645^2 + 2960309^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6780403037875 + ... + 6780403037878.

Almost surely, 2^{27121612151506} is an apocalyptic number.

27121612151506 is a deficient number, since it is larger than the sum of its proper divisors (13560806075756).

27121612151506 is a wasteful number, since it uses less digits than its factorization.

27121612151506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13560806075755.

The product of its (nonzero) digits is 50400, while the sum is 40.

Adding to 27121612151506 its reverse (60515121612172), we get a palindrome (87636733763678).

The spelling of 27121612151506 in words is "twenty-seven trillion, one hundred twenty-one billion, six hundred twelve million, one hundred fifty-one thousand, five hundred six".