1691411379840 has 1536 divisors, whose sum is σ = 7498535385600. Its totient is φ = 352776093696.

The previous prime is 1691411379817. The next prime is 1691411379859. The reversal of 1691411379840 is 489731141961.

It is a happy number.

1691411379840 is a `hidden beast` number, since 16 + 91 + 411 + 3 + 7 + 98 + 40 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1982896854 + ... + 1982897706.

It is an arithmetic number, because the mean of its divisors is an integer number (4881858975).

Almost surely, 2^{1691411379840} is an apocalyptic number.

1691411379840 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 1691411379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3749267692800).

1691411379840 is an abundant number, since it is smaller than the sum of its proper divisors (5807124005760).

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

1691411379840 is a wasteful number, since it uses less digits than its factorization.

1691411379840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 1691411379840 in words is "one trillion, six hundred ninety-one billion, four hundred eleven million, three hundred seventy-nine thousand, eight hundred forty".