15541962649 has 4 divisors (see below), whose sum is σ = 16456195764. Its totient is φ = 14627729536.

The previous prime is 15541962641. The next prime is 15541962677. The reversal of 15541962649 is 94626914551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12950440000 + 2591522649 = 113800^2 + 50907^2 .

It is a cyclic number.

It is not a de Polignac number, because 15541962649 - 2³ = 15541962641 is a prime.

It is a super-2 number, since 2×15541962649² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15541962596 and 15541962605.

It is not an unprimeable number, because it can be changed into a prime (15541962641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457116532 + ... + 457116565.

It is an arithmetic number, because the mean of its divisors is an integer number (4114048941).

Almost surely, 2^15541962649 is an apocalyptic number.

It is an amenable number.

15541962649 is a deficient number, since it is larger than the sum of its proper divisors (914233115).

15541962649 is an equidigital number, since it uses as much as digits as its factorization.

15541962649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914233114.

The product of its digits is 2332800, while the sum is 52.

The spelling of 15541962649 in words is "fifteen billion, five hundred forty-one million, nine hundred sixty-two thousand, six hundred forty-nine".