51465220225646 has 4 divisors (see below), whose sum is σ = 77197830338472. Its totient is φ = 25732610112822.

The previous prime is 51465220225633. The next prime is 51465220225673. The reversal of 51465220225646 is 64652202256415.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×51465220225646² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51465220225594 and 51465220225603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12866305056410 + ... + 12866305056413.

It is an arithmetic number, because the mean of its divisors is an integer number (19299457584618).

Almost surely, 2^{51465220225646} is an apocalyptic number.

51465220225646 is a deficient number, since it is larger than the sum of its proper divisors (25732610112826).

51465220225646 is a wasteful number, since it uses less digits than its factorization.

51465220225646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25732610112825.

The product of its (nonzero) digits is 6912000, while the sum is 50.

The spelling of 51465220225646 in words is "fifty-one trillion, four hundred sixty-five billion, two hundred twenty million, two hundred twenty-five thousand, six hundred forty-six".