1691326260099 has 48 divisors (see below), whose sum is σ = 2917724682240. Its totient is φ = 965488219920.

The previous prime is 1691326260097. The next prime is 1691326260157. The reversal of 1691326260099 is 9900626231961.

1691326260099 is a `hidden beast` number, since 1 + 6 + 9 + 1 + 3 + 2 + 626 + 0 + 0 + 9 + 9 = 666.

It is a Cunningham number, because it is equal to 1300510²-1.

It is not a de Polignac number, because 1691326260099 - 2¹ = 1691326260097 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1691326260097) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 650254 + ... + 1950764.

It is an arithmetic number, because the mean of its divisors is an integer number (60785930880).

Almost surely, 2^{1691326260099} is an apocalyptic number.

1691326260099 is a deficient number, since it is larger than the sum of its proper divisors (1226398422141).

1691326260099 is a wasteful number, since it uses less digits than its factorization.

1691326260099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301517 (or 1301504 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 54.

The spelling of 1691326260099 in words is "one trillion, six hundred ninety-one billion, three hundred twenty-six million, two hundred sixty thousand, ninety-nine".