1001721387685 has 8 divisors (see below), whose sum is σ = 1202106729600. Its totient is φ = 801349733904.

The previous prime is 1001721387679. The next prime is 1001721387691. The reversal of 1001721387685 is 5867831271001.

It is an interprime number because it is at equal distance from previous prime (1001721387679) and next prime (1001721387691).

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 1001721387685 - 2³ = 1001721387677 is a prime.

It is a congruent 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, 3260337 + ... + 3554326.

It is an arithmetic number, because the mean of its divisors is an integer number (150263341200).

Almost surely, 2^{1001721387685} is an apocalyptic number.

It is an amenable number.

1001721387685 is a deficient number, since it is larger than the sum of its proper divisors (200385341915).

1001721387685 is an equidigital number, since it uses as much as digits as its factorization.

1001721387685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6844067.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 1001721387685 in words is "one trillion, one billion, seven hundred twenty-one million, three hundred eighty-seven thousand, six hundred eighty-five".