51191449702 has 4 divisors (see below), whose sum is σ = 76787174556. Its totient is φ = 25595724850.

The previous prime is 51191449549. The next prime is 51191449717. The reversal of 51191449702 is 20794419115.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12797862424 + ... + 12797862427.

It is an arithmetic number, because the mean of its divisors is an integer number (19196793639).

Almost surely, 2^51191449702 is an apocalyptic number.

51191449702 is a deficient number, since it is larger than the sum of its proper divisors (25595724854).

51191449702 is a wasteful number, since it uses less digits than its factorization.

51191449702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25595724853.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 51191449702 in words is "fifty-one billion, one hundred ninety-one million, four hundred forty-nine thousand, seven hundred two".