51236646403 has 4 divisors (see below), whose sum is σ = 52076591488. Its totient is φ = 50396701320.

The previous prime is 51236646319. The next prime is 51236646421. The reversal of 51236646403 is 30464663215.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51236646403 - 2²⁹ = 50699775491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51236646803) 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, 419972451 + ... + 419972572.

It is an arithmetic number, because the mean of its divisors is an integer number (13019147872).

Almost surely, 2^51236646403 is an apocalyptic number.

51236646403 is a deficient number, since it is larger than the sum of its proper divisors (839945085).

51236646403 is an equidigital number, since it uses as much as digits as its factorization.

51236646403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839945084.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 51236646403 in words is "fifty-one billion, two hundred thirty-six million, six hundred forty-six thousand, four hundred three".