51240043015 has 32 divisors (see below), whose sum is σ = 72721774080. Its totient is φ = 33912057984.

The previous prime is 51240043013. The next prime is 51240043021. The reversal of 51240043015 is 51034004215.

It is a happy number.

It is not a de Polignac number, because 51240043015 - 2¹ = 51240043013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240043013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3389664 + ... + 3404746.

It is an arithmetic number, because the mean of its divisors is an integer number (2272555440).

Almost surely, 2^51240043015 is an apocalyptic number.

51240043015 is a deficient number, since it is larger than the sum of its proper divisors (21481731065).

51240043015 is a wasteful number, since it uses less digits than its factorization.

51240043015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18471.

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 51240043015 in words is "fifty-one billion, two hundred forty million, forty-three thousand, fifteen".