51663166778510 has 64 divisors (see below), whose sum is σ = 108455381028864. Its totient is φ = 17351334000000.

The previous prime is 51663166778471. The next prime is 51663166778513. The reversal of 51663166778510 is 1587766136615.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51663166778513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8693366 + ... + 13375385.

It is an arithmetic number, because the mean of its divisors is an integer number (1694615328576).

Almost surely, 2^{51663166778510} is an apocalyptic number.

51663166778510 is an abundant number, since it is smaller than the sum of its proper divisors (56792214250354).

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

51663166778510 is a wasteful number, since it uses less digits than its factorization.

51663166778510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22069449.

The product of its (nonzero) digits is 38102400, while the sum is 62.

The spelling of 51663166778510 in words is "fifty-one trillion, six hundred sixty-three billion, one hundred sixty-six million, seven hundred seventy-eight thousand, five hundred ten".