12540402165154 has 4 divisors (see below), whose sum is σ = 18810603247734. Its totient is φ = 6270201082576.

The previous prime is 12540402165107. The next prime is 12540402165169. The reversal of 12540402165154 is 45156120404521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12280223619225 + 260178545929 = 3504315^2 + 510077^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3135100541287 + ... + 3135100541290.

Almost surely, 2^{12540402165154} is an apocalyptic number.

12540402165154 is a deficient number, since it is larger than the sum of its proper divisors (6270201082580).

12540402165154 is an equidigital number, since it uses as much as digits as its factorization.

12540402165154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6270201082579.

The product of its (nonzero) digits is 192000, while the sum is 40.

Adding to 12540402165154 its reverse (45156120404521), we get a palindrome (57696522569675).

The spelling of 12540402165154 in words is "twelve trillion, five hundred forty billion, four hundred two million, one hundred sixty-five thousand, one hundred fifty-four".