51709211440 has 40 divisors (see below), whose sum is σ = 127295915040. Its totient is φ = 19466996736.

The previous prime is 51709211429. The next prime is 51709211549. The reversal of 51709211440 is 4411290715.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 51709211396 and 51709211405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19009380 + ... + 19012099.

It is an arithmetic number, because the mean of its divisors is an integer number (3182397876).

Almost surely, 2^51709211440 is an apocalyptic number.

It is an amenable number.

51709211440 is an abundant number, since it is smaller than the sum of its proper divisors (75586703600).

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

51709211440 is a wasteful number, since it uses less digits than its factorization.

51709211440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38021509 (or 38021503 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 51709211440 in words is "fifty-one billion, seven hundred nine million, two hundred eleven thousand, four hundred forty".