51161711700 has 72 divisors (see below), whose sum is σ = 161484976800. Its totient is φ = 12402838400.

The previous prime is 51161711693. The next prime is 51161711723. The reversal of 51161711700 is 711716115.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7748475 + ... + 7755074.

It is an arithmetic number, because the mean of its divisors is an integer number (2242846900).

Almost surely, 2^51161711700 is an apocalyptic number.

51161711700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51161711700 is an abundant number, since it is smaller than the sum of its proper divisors (110323265100).

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

51161711700 is a wasteful number, since it uses less digits than its factorization.

51161711700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15503577 (or 15503570 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 30.

The spelling of 51161711700 in words is "fifty-one billion, one hundred sixty-one million, seven hundred eleven thousand, seven hundred".