2151669744 has 420 divisors, whose sum is σ = 7642378416. Its totient is φ = 574428672.

The previous prime is 2151669743. The next prime is 2151669781. The reversal of 2151669744 is 4479661512.

2151669744 is a `hidden beast` number, since 2 + 1 + 516 + 6 + 97 + 44 = 666.

Its product of digits (362880) is a multiple of the sum of its prime factors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 2151669744.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151669743) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 29474892 + ... + 29474964.

Almost surely, 2^2151669744 is an apocalyptic number.

2151669744 is a gapful number since it is divisible by the number (24) 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 2151669744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3821189208).

2151669744 is an abundant number, since it is smaller than the sum of its proper divisors (5490708672).

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

2151669744 is an equidigital number, since it uses as much as digits as its factorization.

2151669744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 104 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 2151669744 is about 46386.0942955968. The cubic root of 2151669744 is about 1290.9969146192.

The spelling of 2151669744 in words is "two billion, one hundred fifty-one million, six hundred sixty-nine thousand, seven hundred forty-four".