51240686357 has 72 divisors (see below), whose sum is σ = 64743500160. Its totient is φ = 40419025920.

The previous prime is 51240686353. The next prime is 51240686381. The reversal of 51240686357 is 75368604215.

It is not a de Polignac number, because 51240686357 - 2² = 51240686353 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 (51240686353) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 182351057 + ... + 182351337.

It is an arithmetic number, because the mean of its divisors is an integer number (899215280).

Almost surely, 2^51240686357 is an apocalyptic number.

It is an amenable number.

51240686357 is a deficient number, since it is larger than the sum of its proper divisors (13502813803).

51240686357 is a wasteful number, since it uses less digits than its factorization.

51240686357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 51240686357 in words is "fifty-one billion, two hundred forty million, six hundred eighty-six thousand, three hundred fifty-seven".