15651551649 has 8 divisors (see below), whose sum is σ = 21018870880. Its totient is φ = 10359300096.

The previous prime is 15651551647. The next prime is 15651551677. The reversal of 15651551649 is 94615515651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15651551649 - 2¹ = 15651551647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15651551598 and 15651551607.

It is not an unprimeable number, because it can be changed into a prime (15651551647) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 18766432 + ... + 18767265.

It is an arithmetic number, because the mean of its divisors is an integer number (2627358860).

Almost surely, 2^15651551649 is an apocalyptic number.

It is an amenable number.

15651551649 is a deficient number, since it is larger than the sum of its proper divisors (5367319231).

15651551649 is a wasteful number, since it uses less digits than its factorization.

15651551649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37533839.

The product of its digits is 810000, while the sum is 48.

The spelling of 15651551649 in words is "fifteen billion, six hundred fifty-one million, five hundred fifty-one thousand, six hundred forty-nine".