13151661506 has 4 divisors (see below), whose sum is σ = 19727492262. Its totient is φ = 6575830752.

The previous prime is 13151661493. The next prime is 13151661539. The reversal of 13151661506 is 60516615131.

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., 6697949281 + 6453712225 = 81841^2 + 80335^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3287915375 + ... + 3287915378.

Almost surely, 2^13151661506 is an apocalyptic number.

13151661506 is a deficient number, since it is larger than the sum of its proper divisors (6575830756).

13151661506 is an equidigital number, since it uses as much as digits as its factorization.

13151661506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6575830755.

The product of its (nonzero) digits is 16200, while the sum is 35.

The spelling of 13151661506 in words is "thirteen billion, one hundred fifty-one million, six hundred sixty-one thousand, five hundred six".