51015021671653 has 4 divisors (see below), whose sum is σ = 54939254107948. Its totient is φ = 47090789235360.

The previous prime is 51015021671651. The next prime is 51015021671681. The reversal of 51015021671653 is 35617612051015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29289559992289 + 21725461679364 = 5411983^2 + 4661058^2 .

It is not a de Polignac number, because 51015021671653 - 2¹ = 51015021671651 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 (51015021671651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1962116218128 + ... + 1962116218153.

It is an arithmetic number, because the mean of its divisors is an integer number (13734813526987).

Almost surely, 2^{51015021671653} is an apocalyptic number.

It is an amenable number.

51015021671653 is a deficient number, since it is larger than the sum of its proper divisors (3924232436295).

51015021671653 is a wasteful number, since it uses less digits than its factorization.

51015021671653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924232436294.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 51015021671653 in words is "fifty-one trillion, fifteen billion, twenty-one million, six hundred seventy-one thousand, six hundred fifty-three".