1621246143556 has 48 divisors (see below), whose sum is σ = 3091210138800. Its totient is φ = 739511764992.

The previous prime is 1621246143551. The next prime is 1621246143571. The reversal of 1621246143556 is 6553416421261.

It can be written as a sum of positive squares in 8 ways, for example, as 348140121156 + 1273106022400 = 590034^2 + 1128320^2 .

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 15 ways as a sum of consecutive naturals, for example, 9882730 + ... + 10045438.

It is an arithmetic number, because the mean of its divisors is an integer number (64400211225).

Almost surely, 2^{1621246143556} is an apocalyptic number.

It is an amenable number.

1621246143556 is a deficient number, since it is larger than the sum of its proper divisors (1469963995244).

1621246143556 is a wasteful number, since it uses less digits than its factorization.

1621246143556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164968 (or 164966 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The spelling of 1621246143556 in words is "one trillion, six hundred twenty-one billion, two hundred forty-six million, one hundred forty-three thousand, five hundred fifty-six".