1721641615055 has 16 divisors (see below), whose sum is σ = 2081893968000. Its totient is φ = 1366698821280.

The previous prime is 1721641614997. The next prime is 1721641615061. The reversal of 1721641615055 is 5505161461271.

It is not a de Polignac number, because 1721641615055 - 2⁶ = 1721641614991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1721641614997 and 1721641615015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9538436 + ... + 9717254.

It is an arithmetic number, because the mean of its divisors is an integer number (130118373000).

Almost surely, 2^{1721641615055} is an apocalyptic number.

1721641615055 is a deficient number, since it is larger than the sum of its proper divisors (360252352945).

1721641615055 is a wasteful number, since it uses less digits than its factorization.

1721641615055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193654.

The product of its (nonzero) digits is 252000, while the sum is 44.

The spelling of 1721641615055 in words is "one trillion, seven hundred twenty-one billion, six hundred forty-one million, six hundred fifteen thousand, fifty-five".