5121656642 has 16 divisors (see below), whose sum is σ = 7890191232. Its totient is φ = 2492033040.

The previous prime is 5121656609. The next prime is 5121656651. The reversal of 5121656642 is 2466561215.

It is a junction number, because it is equal to n+sod(n) for n = 5121656596 and 5121656605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86573 + ... + 133184.

It is an arithmetic number, because the mean of its divisors is an integer number (493136952).

Almost surely, 2^5121656642 is an apocalyptic number.

5121656642 is a deficient number, since it is larger than the sum of its proper divisors (2768534590).

5121656642 is a wasteful number, since it uses less digits than its factorization.

5121656642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220073.

The product of its digits is 86400, while the sum is 38.

The square root of 5121656642 is about 71565.7504816375. The cubic root of 5121656642 is about 1723.7336240108.

The spelling of 5121656642 in words is "five billion, one hundred twenty-one million, six hundred fifty-six thousand, six hundred forty-two".