51613012620515 has 4 divisors (see below), whose sum is σ = 61935615144624. Its totient is φ = 41290410096408.

The previous prime is 51613012620469. The next prime is 51613012620523. The reversal of 51613012620515 is 51502621031615.

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

It is a cyclic number.

It is not a de Polignac number, because 51613012620515 - 2¹⁸ = 51613012358371 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5161301262047 + ... + 5161301262056.

It is an arithmetic number, because the mean of its divisors is an integer number (15483903786156).

Almost surely, 2^{51613012620515} is an apocalyptic number.

51613012620515 is a deficient number, since it is larger than the sum of its proper divisors (10322602524109).

51613012620515 is a wasteful number, since it uses less digits than its factorization.

51613012620515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10322602524108.

The product of its (nonzero) digits is 54000, while the sum is 38.

It can be divided in two parts, 516 and 13012620515, that added together give a palindrome (13012621031).

The spelling of 51613012620515 in words is "fifty-one trillion, six hundred thirteen billion, twelve million, six hundred twenty thousand, five hundred fifteen".