1261672616 has 16 divisors (see below), whose sum is σ = 2366212500. Its totient is φ = 630682624.

The previous prime is 1261672609. The next prime is 1261672619. The reversal of 1261672616 is 6162761621.

It can be written as a sum of positive squares in 2 ways, for example, as 921122500 + 340550116 = 30350^2 + 18454^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1261672616.

It is not an unprimeable number, because it can be changed into a prime (1261672619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20510 + ... + 54258.

Almost surely, 2^1261672616 is an apocalyptic number.

It is an amenable number.

1261672616 is a deficient number, since it is larger than the sum of its proper divisors (1104539884).

1261672616 is a wasteful number, since it uses less digits than its factorization.

1261672616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38428 (or 38424 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 1261672616 is about 35520.0311936800. The cubic root of 1261672616 is about 1080.5600136348.

The spelling of 1261672616 in words is "one billion, two hundred sixty-one million, six hundred seventy-two thousand, six hundred sixteen".