51448991257 has 8 divisors (see below), whose sum is σ = 51536116800. Its totient is φ = 51361908144.

The previous prime is 51448991239. The next prime is 51448991273. The reversal of 51448991257 is 75219984415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51448991257 - 2¹¹ = 51448989209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51448991198 and 51448991207.

It is not an unprimeable number, because it can be changed into a prime (51448991287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3215844 + ... + 3231802.

It is an arithmetic number, because the mean of its divisors is an integer number (6442014600).

Almost surely, 2^51448991257 is an apocalyptic number.

It is an amenable number.

51448991257 is a deficient number, since it is larger than the sum of its proper divisors (87125543).

51448991257 is a wasteful number, since it uses less digits than its factorization.

51448991257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21215.

The product of its digits is 3628800, while the sum is 55.

The spelling of 51448991257 in words is "fifty-one billion, four hundred forty-eight million, nine hundred ninety-one thousand, two hundred fifty-seven".