51457013623 has 4 divisors (see below), whose sum is σ = 51461503920. Its totient is φ = 51452523328.

The previous prime is 51457013579. The next prime is 51457013627. The reversal of 51457013623 is 32631075415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32631075415 = 5 ⋅6526215083.

It is a cyclic number.

It is not a de Polignac number, because 51457013623 - 2¹⁷ = 51456882551 is a prime.

It is a super-2 number, since 2×51457013623² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51457013627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2227915 + ... + 2250892.

It is an arithmetic number, because the mean of its divisors is an integer number (12865375980).

Almost surely, 2^51457013623 is an apocalyptic number.

51457013623 is a deficient number, since it is larger than the sum of its proper divisors (4490297).

51457013623 is a wasteful number, since it uses less digits than its factorization.

51457013623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4490296.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 51457013623 in words is "fifty-one billion, four hundred fifty-seven million, thirteen thousand, six hundred twenty-three".