1540043770225 has 27 divisors (see below), whose sum is σ = 2015606594763. Its totient is φ = 1167101717040.

The previous prime is 1540043770201. The next prime is 1540043770247. The reversal of 1540043770225 is 5220773400451.

The square root of 1540043770225 is 1240985.

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

It can be written as a sum of positive squares in only one way, i.e., 554415757281 + 985628012944 = 744591^2 + 992788^2 .

It is not a de Polignac number, because 1540043770225 - 2²⁹ = 1539506899313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 117887044 + ... + 117900106.

Almost surely, 2^{1540043770225} is an apocalyptic number.

1540043770225 is the 1240985-th square number.

1540043770225 is the 620493-rd centered octagonal number.

It is an amenable number.

1540043770225 is a deficient number, since it is larger than the sum of its proper divisors (475562824538).

1540043770225 is an frugal number, since it uses more digits than its factorization.

1540043770225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26174 (or 13087 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 40.

The spelling of 1540043770225 in words is "one trillion, five hundred forty billion, forty-three million, seven hundred seventy thousand, two hundred twenty-five".