1721659748688 has 480 divisors, whose sum is σ = 5758850552832. Its totient is φ = 474041548800.

The previous prime is 1721659748621. The next prime is 1721659748693. The reversal of 1721659748688 is 8868479561271.

It is a happy number.

1721659748688 is a `hidden beast` number, since 1 + 7 + 2 + 1 + 65 + 9 + 7 + 486 + 88 = 666.

It is a super-2 number, since 2×1721659748688² (a number of 25 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 381486720 + ... + 381491232.

Almost surely, 2^{1721659748688} is an apocalyptic number.

1721659748688 is a gapful number since it is divisible by the number (18) 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 1721659748688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2879425276416).

1721659748688 is an abundant number, since it is smaller than the sum of its proper divisors (4037190804144).

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

1721659748688 is a wasteful number, since it uses less digits than its factorization.

1721659748688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043 (or 5034 counting only the distinct ones).

The product of its digits is 325140480, while the sum is 72.

The spelling of 1721659748688 in words is "one trillion, seven hundred twenty-one billion, six hundred fifty-nine million, seven hundred forty-eight thousand, six hundred eighty-eight".