51249968446 has 4 divisors (see below), whose sum is σ = 76874952672. Its totient is φ = 25624984222.

The previous prime is 51249968443. The next prime is 51249968479. The reversal of 51249968446 is 64486994215.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51249968443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12812492110 + ... + 12812492113.

It is an arithmetic number, because the mean of its divisors is an integer number (19218738168).

Almost surely, 2^51249968446 is an apocalyptic number.

51249968446 is a deficient number, since it is larger than the sum of its proper divisors (25624984226).

51249968446 is a wasteful number, since it uses less digits than its factorization.

51249968446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25624984225.

The product of its digits is 14929920, while the sum is 58.

The spelling of 51249968446 in words is "fifty-one billion, two hundred forty-nine million, nine hundred sixty-eight thousand, four hundred forty-six".