2155019776 has 160 divisors (see below), whose sum is σ = 5532645888. Its totient is φ = 815063040.

The previous prime is 2155019771. The next prime is 2155019791. The reversal of 2155019776 is 6779105512.

It is a super-2 number, since 2×2155019776² = 9288220469902180352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155019771) 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, 1070611 + ... + 1072621.

Almost surely, 2^2155019776 is an apocalyptic number.

2155019776 is a gapful number since it is divisible by the number (26) 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 2155019776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2766322944).

2155019776 is an abundant number, since it is smaller than the sum of its proper divisors (3377626112).

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

2155019776 is a wasteful number, since it uses less digits than its factorization.

2155019776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072 (or 2056 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 43.

The square root of 2155019776 is about 46422.1905558107. The cubic root of 2155019776 is about 1291.6665710403. Note that the first 3 decimals are identical.

The spelling of 2155019776 in words is "two billion, one hundred fifty-five million, nineteen thousand, seven hundred seventy-six".