2165502401000 has 32 divisors (see below), whose sum is σ = 5067275620680. Its totient is φ = 866200960000.

The previous prime is 2165502400973. The next prime is 2165502401011. The reversal of 2165502401000 is 1042055612.

It can be written as a sum of positive squares in 4 ways, for example, as 130160765284 + 2035341635716 = 360778^2 + 1426654^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1082750201 + ... + 1082752200.

Almost surely, 2^{2165502401000} is an apocalyptic number.

2165502401000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165502401000 is an abundant number, since it is smaller than the sum of its proper divisors (2901773219680).

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

2165502401000 is a wasteful number, since it uses less digits than its factorization.

2165502401000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165502422 (or 2165502408 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 2165502401000 its reverse (1042055612), we get a palindrome (2166544456612).

The spelling of 2165502401000 in words is "two trillion, one hundred sixty-five billion, five hundred two million, four hundred one thousand".