2666401520 has 80 divisors (see below), whose sum is σ = 6438337920. Its totient is φ = 1025740800.

The previous prime is 2666401511. The next prime is 2666401541. The reversal of 2666401520 is 251046662.

It is a tau number, because it is divible by the number of its divisors (80).

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, 626600 + ... + 630840.

It is an arithmetic number, because the mean of its divisors is an integer number (80479224).

Almost surely, 2^2666401520 is an apocalyptic number.

2666401520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2666401520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3219168960).

2666401520 is an abundant number, since it is smaller than the sum of its proper divisors (3771936400).

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

2666401520 is a wasteful number, since it uses less digits than its factorization.

2666401520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554 (or 4548 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 2666401520 is about 51637.2106140523. The cubic root of 2666401520 is about 1386.6765865702.

The spelling of 2666401520 in words is "two billion, six hundred sixty-six million, four hundred one thousand, five hundred twenty".