1640123221550 has 48 divisors (see below), whose sum is σ = 3338013746304. Its totient is φ = 594606540000.

The previous prime is 1640123221531. The next prime is 1640123221559. The reversal of 1640123221550 is 551223210461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640123221559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4322546 + ... + 4686645.

It is an arithmetic number, because the mean of its divisors is an integer number (69541953048).

Almost surely, 2^{1640123221550} is an apocalyptic number.

1640123221550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640123221550 is an abundant number, since it is smaller than the sum of its proper divisors (1697890524754).

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

1640123221550 is a wasteful number, since it uses less digits than its factorization.

1640123221550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9009545 (or 9009540 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 1640123221550 in words is "one trillion, six hundred forty billion, one hundred twenty-three million, two hundred twenty-one thousand, five hundred fifty".