51615444451615 has 16 divisors (see below), whose sum is σ = 67571277570720. Its totient is φ = 37537411461120.

The previous prime is 51615444451609. The next prime is 51615444451631.

51615444451615 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51615444451615 - 2¹¹ = 51615444449567 is a prime.

It is a super-2 number, since 2×51615444451615² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11762454 + ... + 15543043.

It is an arithmetic number, because the mean of its divisors is an integer number (4223204848170).

Almost surely, 2^{51615444451615} is an apocalyptic number.

51615444451615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51615444451615 is a deficient number, since it is larger than the sum of its proper divisors (15955833119105).

51615444451615 is a wasteful number, since it uses less digits than its factorization.

51615444451615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27339882.

The product of its digits is 5760000, while the sum is 52.

The spelling of 51615444451615 in words is "fifty-one trillion, six hundred fifteen billion, four hundred forty-four million, four hundred fifty-one thousand, six hundred fifteen".