51366145202 has 4 divisors (see below), whose sum is σ = 77049217806. Its totient is φ = 25683072600.

The previous prime is 51366145199. The next prime is 51366145291. The reversal of 51366145202 is 20254166315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20254166315 = 5 ⋅4050833263.

It can be written as a sum of positive squares in only one way, i.e., 26208695881 + 25157449321 = 161891^2 + 158611^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12841536299 + ... + 12841536302.

Almost surely, 2^51366145202 is an apocalyptic number.

51366145202 is a deficient number, since it is larger than the sum of its proper divisors (25683072604).

51366145202 is a wasteful number, since it uses less digits than its factorization.

51366145202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25683072603.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 51366145202 in words is "fifty-one billion, three hundred sixty-six million, one hundred forty-five thousand, two hundred two".