1540543123251 has 32 divisors (see below), whose sum is σ = 2509371187200. Its totient is φ = 926310803040.

The previous prime is 1540543123237. The next prime is 1540543123253. The reversal of 1540543123251 is 1523213450451.

1540543123251 is a `hidden beast` number, since 1 + 5 + 40 + 54 + 312 + 3 + 251 = 666.

It is not a de Polignac number, because 1540543123251 - 2⁹ = 1540543122739 is a prime.

It is a super-2 number, since 2×1540543123251² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1540543123253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20383596 + ... + 20459033.

It is an arithmetic number, because the mean of its divisors is an integer number (78417849600).

Almost surely, 2^{1540543123251} is an apocalyptic number.

1540543123251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1540543123251 is a deficient number, since it is larger than the sum of its proper divisors (968828063949).

1540543123251 is a wasteful number, since it uses less digits than its factorization.

1540543123251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40842776 (or 40842770 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 1540543123251 in words is "one trillion, five hundred forty billion, five hundred forty-three million, one hundred twenty-three thousand, two hundred fifty-one".