1621664604150 has 48 divisors (see below), whose sum is σ = 4022286170304. Its totient is φ = 432383899680.

The previous prime is 1621664604149. The next prime is 1621664604151. The reversal of 1621664604150 is 514064661261.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1621664604149) and next prime (1621664604151).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621664604151) 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, 340137 + ... + 1832763.

It is an arithmetic number, because the mean of its divisors is an integer number (83797628548).

Almost surely, 2^{1621664604150} is an apocalyptic number.

1621664604150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1621664604150 is an abundant number, since it is smaller than the sum of its proper divisors (2400621566154).

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

1621664604150 is a wasteful number, since it uses less digits than its factorization.

1621664604150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499885 (or 1499880 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 1621664604150 in words is "one trillion, six hundred twenty-one billion, six hundred sixty-four million, six hundred four thousand, one hundred fifty".