15774648649 has 2 divisors, whose sum is σ = 15774648650. Its totient is φ = 15774648648.

The previous prime is 15774648641. The next prime is 15774648671. The reversal of 15774648649 is 94684647751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15068790025 + 705858624 = 122755^2 + 26568^2 .

It is a cyclic number.

It is not a de Polignac number, because 15774648649 - 2³ = 15774648641 is a prime.

It is not a weakly prime, because it can be changed into another prime (15774648641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7887324324 + 7887324325.

It is an arithmetic number, because the mean of its divisors is an integer number (7887324325).

Almost surely, 2^15774648649 is an apocalyptic number.

It is an amenable number.

15774648649 is a deficient number, since it is larger than the sum of its proper divisors (1).

15774648649 is an equidigital number, since it uses as much as digits as its factorization.

15774648649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40642560, while the sum is 61.

The spelling of 15774648649 in words is "fifteen billion, seven hundred seventy-four million, six hundred forty-eight thousand, six hundred forty-nine".