2115641041478 has 4 divisors (see below), whose sum is σ = 3173461562220. Its totient is φ = 1057820520738.

The previous prime is 2115641041471. The next prime is 2115641041487. The reversal of 2115641041478 is 8741401465112.

It is a happy number.

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

It is a super-2 number, since 2×2115641041478² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115641041471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528910260368 + ... + 528910260371.

It is an arithmetic number, because the mean of its divisors is an integer number (793365390555).

Almost surely, 2^{2115641041478} is an apocalyptic number.

2115641041478 is a deficient number, since it is larger than the sum of its proper divisors (1057820520742).

2115641041478 is a wasteful number, since it uses less digits than its factorization.

2115641041478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057820520741.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 2115641041478 in words is "two trillion, one hundred fifteen billion, six hundred forty-one million, forty-one thousand, four hundred seventy-eight".