1691470466639 has 4 divisors (see below), whose sum is σ = 1691476150056. Its totient is φ = 1691464783224.

The previous prime is 1691470466633. The next prime is 1691470466641. The reversal of 1691470466639 is 9366640741961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1691470466639 - 2¹² = 1691470462543 is a prime.

It is a super-2 number, since 2×1691470466639² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691470466633) 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, 2369084 + ... + 2999249.

It is an arithmetic number, because the mean of its divisors is an integer number (422869037514).

Almost surely, 2^{1691470466639} is an apocalyptic number.

1691470466639 is a deficient number, since it is larger than the sum of its proper divisors (5683417).

1691470466639 is an equidigital number, since it uses as much as digits as its factorization.

1691470466639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683416.

The product of its (nonzero) digits is 35271936, while the sum is 62.

The spelling of 1691470466639 in words is "one trillion, six hundred ninety-one billion, four hundred seventy million, four hundred sixty-six thousand, six hundred thirty-nine".