15761044849 has 27 divisors (see below), whose sum is σ = 17653562017. Its totient is φ = 14060816000.

The previous prime is 15761044847. The next prime is 15761044853. The reversal of 15761044849 is 94844016751.

The square root of 15761044849 is 125543.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 68973025 + 15692071824 = 8305^2 + 125268^2 .

It is not a de Polignac number, because 15761044849 - 2¹ = 15761044847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15761044847) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 139478217 + ... + 139478329.

Almost surely, 2^15761044849 is an apocalyptic number.

15761044849 is the 125543-rd square number.

15761044849 is the 62772-nd centered octagonal number.

It is an amenable number.

15761044849 is a deficient number, since it is larger than the sum of its proper divisors (1892517168).

15761044849 is an equidigital number, since it uses as much as digits as its factorization.

15761044849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

Multiplying 15761044849 by its sum of digits (49), we get a square (772291197601 = 878801²).

The spelling of 15761044849 in words is "fifteen billion, seven hundred sixty-one million, forty-four thousand, eight hundred forty-nine".