51820470654 has 16 divisors (see below), whose sum is σ = 104457013248. Its totient is φ = 17137478232.

The previous prime is 51820470641. The next prime is 51820470659. The reversal of 51820470654 is 45607402815.

It is a happy number.

51820470654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51820470654² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51820470659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34002172 + ... + 34003695.

It is an arithmetic number, because the mean of its divisors is an integer number (6528563328).

Almost surely, 2^51820470654 is an apocalyptic number.

51820470654 is an abundant number, since it is smaller than the sum of its proper divisors (52636542594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51820470654 is a wasteful number, since it uses less digits than its factorization.

51820470654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68005999.

The product of its (nonzero) digits is 268800, while the sum is 42.

The spelling of 51820470654 in words is "fifty-one billion, eight hundred twenty million, four hundred seventy thousand, six hundred fifty-four".