15181200649 has 2 divisors, whose sum is σ = 15181200650. Its totient is φ = 15181200648.

The previous prime is 15181200647. The next prime is 15181200757. The reversal of 15181200649 is 94600218151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14648745024 + 532455625 = 121032^2 + 23075^2 .

It is a cyclic number.

It is not a de Polignac number, because 15181200649 - 2¹ = 15181200647 is a prime.

Together with 15181200647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15181200647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7590600324 + 7590600325.

It is an arithmetic number, because the mean of its divisors is an integer number (7590600325).

Almost surely, 2^15181200649 is an apocalyptic number.

It is an amenable number.

15181200649 is a deficient number, since it is larger than the sum of its proper divisors (1).

15181200649 is an equidigital number, since it uses as much as digits as its factorization.

15181200649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 15181200649 in words is "fifteen billion, one hundred eighty-one million, two hundred thousand, six hundred forty-nine".