19440652649 has 8 divisors (see below), whose sum is σ = 21234942048. Its totient is φ = 17650856160.

The previous prime is 19440652631. The next prime is 19440652667. The reversal of 19440652649 is 94625604491.

It is an interprime number because it is at equal distance from previous prime (19440652631) and next prime (19440652667).

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

It is a cyclic number.

It is not a de Polignac number, because 19440652649 - 2⁸ = 19440652393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19440652597 and 19440652606.

It is not an unprimeable number, because it can be changed into a prime (19440652249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1114172 + ... + 1131485.

It is an arithmetic number, because the mean of its divisors is an integer number (2654367756).

Almost surely, 2^19440652649 is an apocalyptic number.

It is an amenable number.

19440652649 is a deficient number, since it is larger than the sum of its proper divisors (1794289399).

19440652649 is a wasteful number, since it uses less digits than its factorization.

19440652649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246455.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 19440652649 in words is "nineteen billion, four hundred forty million, six hundred fifty-two thousand, six hundred forty-nine".