51749446437 has 18 divisors (see below), whose sum is σ = 80502966726. Its totient is φ = 31844298960.

The previous prime is 51749446423. The next prime is 51749446447. The reversal of 51749446437 is 73464494715.

51749446437 is a `hidden beast` number, since 5 + 174 + 9 + 4 + 464 + 3 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 35826539841 + 15922906596 = 189279^2 + 126186^2 .

It is not a de Polignac number, because 51749446437 - 2⁸ = 51749446181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51749446447) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2450112 + ... + 2471142.

Almost surely, 2^51749446437 is an apocalyptic number.

It is an amenable number.

51749446437 is a deficient number, since it is larger than the sum of its proper divisors (28753520289).

51749446437 is an frugal number, since it uses more digits than its factorization.

51749446437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42081 (or 21047 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 54.

The spelling of 51749446437 in words is "fifty-one billion, seven hundred forty-nine million, four hundred forty-six thousand, four hundred thirty-seven".