1721540016155 has 8 divisors (see below), whose sum is σ = 2086301960784. Its totient is φ = 1363596052000.

The previous prime is 1721540016139. The next prime is 1721540016167. The reversal of 1721540016155 is 5516100451271.

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

It is not a de Polignac number, because 1721540016155 - 2⁴ = 1721540016139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1704494561 + ... + 1704495570.

It is an arithmetic number, because the mean of its divisors is an integer number (260787745098).

Almost surely, 2^{1721540016155} is an apocalyptic number.

1721540016155 is a deficient number, since it is larger than the sum of its proper divisors (364761944629).

1721540016155 is a wasteful number, since it uses less digits than its factorization.

1721540016155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408990237.

The product of its (nonzero) digits is 42000, while the sum is 38.

The spelling of 1721540016155 in words is "one trillion, seven hundred twenty-one billion, five hundred forty million, sixteen thousand, one hundred fifty-five".