163951780650 has 96 divisors (see below), whose sum is σ = 464799834240. Its totient is φ = 37465528320.

The previous prime is 163951780621. The next prime is 163951780661. The reversal of 163951780650 is 56087159361.

It is a junction number, because it is equal to n+sod(n) for n = 163951780593 and 163951780602.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4873086 + ... + 4906614.

It is an arithmetic number, because the mean of its divisors is an integer number (4841664940).

Almost surely, 2^163951780650 is an apocalyptic number.

163951780650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163951780650 is an abundant number, since it is smaller than the sum of its proper divisors (300848053590).

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

163951780650 is a wasteful number, since it uses less digits than its factorization.

163951780650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38208 (or 38203 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 51.

The spelling of 163951780650 in words is "one hundred sixty-three billion, nine hundred fifty-one million, seven hundred eighty thousand, six hundred fifty".