1621246143554 has 8 divisors (see below), whose sum is σ = 2431911971088. Its totient is φ = 810608819860.

The previous prime is 1621246143551. The next prime is 1621246143571. The reversal of 1621246143554 is 4553416421261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1621246143551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6983192 + ... + 7211619.

It is an arithmetic number, because the mean of its divisors is an integer number (303988996386).

Almost surely, 2^{1621246143554} is an apocalyptic number.

1621246143554 is a deficient number, since it is larger than the sum of its proper divisors (810665827534).

1621246143554 is a wasteful number, since it uses less digits than its factorization.

1621246143554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14251920.

The product of its digits is 691200, while the sum is 44.

The spelling of 1621246143554 in words is "one trillion, six hundred twenty-one billion, two hundred forty-six million, one hundred forty-three thousand, five hundred fifty-four".