15749747746 has 16 divisors (see below), whose sum is σ = 24660888120. Its totient is φ = 7536430080.

The previous prime is 15749747723. The next prime is 15749747747. The reversal of 15749747746 is 64774794751.

It can be written as a sum of positive squares in 4 ways, for example, as 12720456225 + 3029291521 = 112785^2 + 55039^2 .

It is a Harshad number since it is a multiple of its sum of digits (61).

It is not an unprimeable number, because it can be changed into a prime (15749747747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1740031 + ... + 1749058.

Almost surely, 2^15749747746 is an apocalyptic number.

15749747746 is a deficient number, since it is larger than the sum of its proper divisors (8911140374).

15749747746 is a wasteful number, since it uses less digits than its factorization.

15749747746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3489189.

The product of its digits is 41489280, while the sum is 61.

The spelling of 15749747746 in words is "fifteen billion, seven hundred forty-nine million, seven hundred forty-seven thousand, seven hundred forty-six".