1621201686040 has 16 divisors (see below), whose sum is σ = 3647703793680. Its totient is φ = 648480674400.

The previous prime is 1621201685911. The next prime is 1621201686131. The reversal of 1621201686040 is 406861021261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20265021036 + ... + 20265021115.

It is an arithmetic number, because the mean of its divisors is an integer number (227981487105).

Almost surely, 2^{1621201686040} is an apocalyptic number.

1621201686040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621201686040 is an abundant number, since it is smaller than the sum of its proper divisors (2026502107640).

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

1621201686040 is a wasteful number, since it uses less digits than its factorization.

1621201686040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40530042162 (or 40530042158 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 1621201686040 in words is "one trillion, six hundred twenty-one billion, two hundred one million, six hundred eighty-six thousand, forty".