51644191356 has 48 divisors (see below), whose sum is σ = 134036733600. Its totient is φ = 17196166656.

The previous prime is 51644191351. The next prime is 51644191363. The reversal of 51644191356 is 65319144615.

51644191356 is a `hidden beast` number, since 51 + 64 + 4 + 191 + 356 = 666.

51644191356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51644191351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157035 + ... + 357698.

It is an arithmetic number, because the mean of its divisors is an integer number (2792431950).

Almost surely, 2^51644191356 is an apocalyptic number.

It is an amenable number.

51644191356 is an abundant number, since it is smaller than the sum of its proper divisors (82392542244).

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

51644191356 is a wasteful number, since it uses less digits than its factorization.

51644191356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515675 (or 515667 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The spelling of 51644191356 in words is "fifty-one billion, six hundred forty-four million, one hundred ninety-one thousand, three hundred fifty-six".