51515421079 has 16 divisors (see below), whose sum is σ = 54961260480. Its totient is φ = 48116390400.

The previous prime is 51515421077. The next prime is 51515421101. The reversal of 51515421079 is 97012451515.

It is a cyclic number.

It is not a de Polignac number, because 51515421079 - 2¹ = 51515421077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515421071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2734737 + ... + 2753509.

It is an arithmetic number, because the mean of its divisors is an integer number (3435078780).

Almost surely, 2^51515421079 is an apocalyptic number.

51515421079 is a deficient number, since it is larger than the sum of its proper divisors (3445839401).

51515421079 is a wasteful number, since it uses less digits than its factorization.

51515421079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20010.

The product of its (nonzero) digits is 63000, while the sum is 40.

The spelling of 51515421079 in words is "fifty-one billion, five hundred fifteen million, four hundred twenty-one thousand, seventy-nine".