2154117660 has 24 divisors (see below), whose sum is σ = 6031529616. Its totient is φ = 574431360.

The previous prime is 2154117659. The next prime is 2154117661. The reversal of 2154117660 is 667114512.

It is an interprime number because it is at equal distance from previous prime (2154117659) and next prime (2154117661).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154117661) 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, 17950921 + ... + 17951040.

It is an arithmetic number, because the mean of its divisors is an integer number (251313734).

Almost surely, 2^2154117660 is an apocalyptic number.

2154117660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154117660 is an abundant number, since it is smaller than the sum of its proper divisors (3877411956).

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

2154117660 is a wasteful number, since it uses less digits than its factorization.

2154117660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35901973 (or 35901971 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 2154117660 is about 46412.4731079911. The cubic root of 2154117660 is about 1291.4863104035.

The spelling of 2154117660 in words is "two billion, one hundred fifty-four million, one hundred seventeen thousand, six hundred sixty".