1621463322066 has 32 divisors (see below), whose sum is σ = 3708752742528. Its totient is φ = 462956376960.

The previous prime is 1621463321993. The next prime is 1621463322071. The reversal of 1621463322066 is 6602233641261.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13223995 + ... + 13346046.

It is an arithmetic number, because the mean of its divisors is an integer number (115898523204).

Almost surely, 2^{1621463322066} is an apocalyptic number.

1621463322066 is an abundant number, since it is smaller than the sum of its proper divisors (2087289420462).

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

1621463322066 is a wasteful number, since it uses less digits than its factorization.

1621463322066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26571506.

The product of its (nonzero) digits is 373248, while the sum is 42.

The spelling of 1621463322066 in words is "one trillion, six hundred twenty-one billion, four hundred sixty-three million, three hundred twenty-two thousand, sixty-six".