51205351405 has 24 divisors (see below), whose sum is σ = 70038609120. Its totient is φ = 35823003840.

The previous prime is 51205351391. The next prime is 51205351411. The reversal of 51205351405 is 50415350215.

It is not a de Polignac number, because 51205351405 - 2¹³ = 51205343213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1578631 + ... + 1610740.

It is an arithmetic number, because the mean of its divisors is an integer number (2918275380).

Almost surely, 2^51205351405 is an apocalyptic number.

It is an amenable number.

51205351405 is a deficient number, since it is larger than the sum of its proper divisors (18833257715).

51205351405 is a wasteful number, since it uses less digits than its factorization.

51205351405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189421 (or 3189408 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 51205351405 in words is "fifty-one billion, two hundred five million, three hundred fifty-one thousand, four hundred five".