1540166741 has 4 divisors (see below), whose sum is σ = 1551408972. Its totient is φ = 1528924512.

The previous prime is 1540166729. The next prime is 1540166743. The reversal of 1540166741 is 1476610451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1476610451 = 19543 ⋅75557.

It can be written as a sum of positive squares in 2 ways, for example, as 757845841 + 782320900 = 27529^2 + 27970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540166741 - 2²⁶ = 1473057877 is a prime.

It is a super-2 number, since 2×1540166741² = 4744227180165122162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540166743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5620910 + ... + 5621183.

It is an arithmetic number, because the mean of its divisors is an integer number (387852243).

Almost surely, 2^1540166741 is an apocalyptic number.

It is an amenable number.

1540166741 is a deficient number, since it is larger than the sum of its proper divisors (11242231).

1540166741 is a wasteful number, since it uses less digits than its factorization.

1540166741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11242230.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1540166741 is about 39244.9581602529. The cubic root of 1540166741 is about 1154.8420268318.

The spelling of 1540166741 in words is "one billion, five hundred forty million, one hundred sixty-six thousand, seven hundred forty-one".