51642469249 has 4 divisors (see below), whose sum is σ = 59019964864. Its totient is φ = 44264973636.

The previous prime is 51642469237. The next prime is 51642469283. The reversal of 51642469249 is 94296424615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51642469249 - 2¹⁵ = 51642436481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51642469196 and 51642469205.

It is not an unprimeable number, because it can be changed into a prime (51642869249) 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, 3688747797 + ... + 3688747810.

It is an arithmetic number, because the mean of its divisors is an integer number (14754991216).

Almost surely, 2^51642469249 is an apocalyptic number.

It is an amenable number.

51642469249 is a deficient number, since it is larger than the sum of its proper divisors (7377495615).

51642469249 is an equidigital number, since it uses as much as digits as its factorization.

51642469249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7377495614.

The product of its digits is 3732480, while the sum is 52.

The spelling of 51642469249 in words is "fifty-one billion, six hundred forty-two million, four hundred sixty-nine thousand, two hundred forty-nine".