1721455855797 has 8 divisors (see below), whose sum is σ = 2295295843680. Its totient is φ = 1147626552560.

The previous prime is 1721455855789. The next prime is 1721455855813. The reversal of 1721455855797 is 7975585541271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1721455855797 - 2³ = 1721455855789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721455855297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2287347 + ... + 2945312.

It is an arithmetic number, because the mean of its divisors is an integer number (286911980460).

Almost surely, 2^{1721455855797} is an apocalyptic number.

It is an amenable number.

1721455855797 is a deficient number, since it is larger than the sum of its proper divisors (573839987883).

1721455855797 is a wasteful number, since it uses less digits than its factorization.

1721455855797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5342323.

The product of its digits is 123480000, while the sum is 66.

The spelling of 1721455855797 in words is "one trillion, seven hundred twenty-one billion, four hundred fifty-five million, eight hundred fifty-five thousand, seven hundred ninety-seven".