4040055780121 has 3 divisors (see below), whose sum is σ = 4040057790111. Its totient is φ = 4040053770132.

The previous prime is 4040055780107. The next prime is 4040055780161. The reversal of 4040055780121 is 1210875500404.

The square root of 4040055780121 is 2009989.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2673260970121 + 1366794810000 = 1635011^2 + 1169100^2 .

It is not a de Polignac number, because 4040055780121 - 2⁷ = 4040055779993 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4040055780161) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1004995 + ... + 3014983.

It is an arithmetic number, because the mean of its divisors is an integer number (1346685930037).

Almost surely, 2^{4040055780121} is an apocalyptic number.

4040055780121 is the 2009989-th square number.

4040055780121 is the 1004995-th centered octagonal number.

It is an amenable number.

4040055780121 is a deficient number, since it is larger than the sum of its proper divisors (2009990).

4040055780121 is an frugal number, since it uses more digits than its factorization.

4040055780121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4019978 (or 2009989 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The spelling of 4040055780121 in words is "four trillion, forty billion, fifty-five million, seven hundred eighty thousand, one hundred twenty-one".