51155654620 has 96 divisors (see below), whose sum is σ = 126798497280. Its totient is φ = 16969409280.

The previous prime is 51155654591. The next prime is 51155654647. The reversal of 51155654620 is 2645655115.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 899635 + ... + 954805.

It is an arithmetic number, because the mean of its divisors is an integer number (1320817680).

Almost surely, 2^51155654620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51155654620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63399248640).

51155654620 is an abundant number, since it is smaller than the sum of its proper divisors (75642842660).

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

51155654620 is a wasteful number, since it uses less digits than its factorization.

51155654620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55403 (or 55401 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 51155654620 in words is "fifty-one billion, one hundred fifty-five million, six hundred fifty-four thousand, six hundred twenty".