1309685994576 has 150 divisors (see below), whose sum is σ = 3810698837946. Its totient is φ = 434260656000.

The previous prime is 1309685994569. The next prime is 1309685994577. The reversal of 1309685994576 is 6754995869031.

1309685994576 is a `hidden beast` number, since 1 + 3 + 0 + 9 + 6 + 85 + 99 + 457 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1078017052176 + 231668942400 = 1038276^2 + 481320^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309685994577) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 47265526 + ... + 47293226.

Almost surely, 2^{1309685994576} is an apocalyptic number.

1309685994576 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309685994576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905349418973).

1309685994576 is an abundant number, since it is smaller than the sum of its proper divisors (2501012843370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1309685994576 is an equidigital number, since it uses as much as digits as its factorization.

1309685994576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28103 (or 27897 counting only the distinct ones).

The product of its (nonzero) digits is 440899200, while the sum is 72.

The spelling of 1309685994576 in words is "one trillion, three hundred nine billion, six hundred eighty-five million, nine hundred ninety-four thousand, five hundred seventy-six".