6660620215501 has 16 divisors (see below), whose sum is σ = 7721475137280. Its totient is φ = 5627143992960.

The previous prime is 6660620215387. The next prime is 6660620215511. The reversal of 6660620215501 is 1055120260666.

It is not a de Polignac number, because 6660620215501 - 2⁷ = 6660620215373 is a prime.

It is a super-3 number, since 3×6660620215501³ (a number of 39 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660620215511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34816 + ... + 3649993.

It is an arithmetic number, because the mean of its divisors is an integer number (482592196080).

Almost surely, 2^{6660620215501} is an apocalyptic number.

It is an amenable number.

6660620215501 is a deficient number, since it is larger than the sum of its proper divisors (1060854921779).

6660620215501 is a wasteful number, since it uses less digits than its factorization.

6660620215501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3688524.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 6660620215501 in words is "six trillion, six hundred sixty billion, six hundred twenty million, two hundred fifteen thousand, five hundred one".