1621148553774 has 24 divisors (see below), whose sum is σ = 3520638175392. Its totient is φ = 539129060160.

The previous prime is 1621148553769. The next prime is 1621148553799. The reversal of 1621148553774 is 4773558411261.

1621148553774 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 14 + 8 + 553 + 7 + 74 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1621148553774.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104474619 + ... + 104490134.

It is an arithmetic number, because the mean of its divisors is an integer number (146693257308).

Almost surely, 2^{1621148553774} is an apocalyptic number.

1621148553774 is an abundant number, since it is smaller than the sum of its proper divisors (1899489621618).

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

1621148553774 is a wasteful number, since it uses less digits than its factorization.

1621148553774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208965192 (or 208965189 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 1621148553774 in words is "one trillion, six hundred twenty-one billion, one hundred forty-eight million, five hundred fifty-three thousand, seven hundred seventy-four".