1691470466640 has 800 divisors, whose sum is σ = 6312338841600. Its totient is φ = 419004472320.

The previous prime is 1691470466633. The next prime is 1691470466641. The reversal of 1691470466640 is 466640741961.

It is a super-2 number, since 2×1691470466640² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691470466641) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 509630901 + ... + 509634219.

It is an arithmetic number, because the mean of its divisors is an integer number (7890423552).

Almost surely, 2^{1691470466640} is an apocalyptic number.

1691470466640 is a gapful number since it is divisible by the number (10) 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 1691470466640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3156169420800).

1691470466640 is an abundant number, since it is smaller than the sum of its proper divisors (4620868374960).

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

1691470466640 is a wasteful number, since it uses less digits than its factorization.

1691470466640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477 (or 3462 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 1691470466640 in words is "one trillion, six hundred ninety-one billion, four hundred seventy million, four hundred sixty-six thousand, six hundred forty".