1721671625660 has 24 divisors (see below), whose sum is σ = 4132011901920. Its totient is φ = 590287414464.

The previous prime is 1721671625627. The next prime is 1721671625669. The reversal of 1721671625660 is 665261761271.

It is a junction number, because it is equal to n+sod(n) for n = 1721671625599 and 1721671625608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721671625669) 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, 6148827095 + ... + 6148827374.

It is an arithmetic number, because the mean of its divisors is an integer number (172167162580).

Almost surely, 2^{1721671625660} is an apocalyptic number.

1721671625660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1721671625660 is an abundant number, since it is smaller than the sum of its proper divisors (2410340276260).

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

1721671625660 is a wasteful number, since it uses less digits than its factorization.

1721671625660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12297654485 (or 12297654483 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 1721671625660 in words is "one trillion, seven hundred twenty-one billion, six hundred seventy-one million, six hundred twenty-five thousand, six hundred sixty".