1540377774477 has 12 divisors (see below), whose sum is σ = 2227598559004. Its totient is φ = 1025714620800.

The previous prime is 1540377774431. The next prime is 1540377774479. The reversal of 1540377774477 is 7744777730451.

1540377774477 is a `hidden beast` number, since 1 + 54 + 0 + 3 + 77 + 77 + 447 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 112900032036 + 1427477742441 = 336006^2 + 1194771^2 .

It is not a de Polignac number, because 1540377774477 - 2⁷ = 1540377774349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540377774479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100316524 + ... + 100331877.

Almost surely, 2^{1540377774477} is an apocalyptic number.

It is an amenable number.

1540377774477 is a deficient number, since it is larger than the sum of its proper divisors (687220784527).

1540377774477 is a wasteful number, since it uses less digits than its factorization.

1540377774477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200649260 (or 200649257 counting only the distinct ones).

The product of its (nonzero) digits is 112943040, while the sum is 63.

The spelling of 1540377774477 in words is "one trillion, five hundred forty billion, three hundred seventy-seven million, seven hundred seventy-four thousand, four hundred seventy-seven".