1299570661 has 8 divisors (see below), whose sum is σ = 1377382104. Its totient is φ = 1221911040.

The previous prime is 1299570641. The next prime is 1299570719. The reversal of 1299570661 is 1660759921.

It can be written as a sum of positive squares in 4 ways, for example, as 106213636 + 1193357025 = 10306^2 + 34545^2 .

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

It is not a de Polignac number, because 1299570661 - 2¹⁹ = 1299046373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299570641) 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, 20080 + ... + 54793.

It is an arithmetic number, because the mean of its divisors is an integer number (172172763).

Almost surely, 2^1299570661 is an apocalyptic number.

It is an amenable number.

1299570661 is a deficient number, since it is larger than the sum of its proper divisors (77811443).

1299570661 is a wasteful number, since it uses less digits than its factorization.

1299570661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75911.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 1299570661 is about 36049.5584022884. The cubic root of 1299570661 is about 1091.2727217476.

The spelling of 1299570661 in words is "one billion, two hundred ninety-nine million, five hundred seventy thousand, six hundred sixty-one".