1621554492060 has 480 divisors, whose sum is σ = 5500107930240. Its totient is φ = 398695385088.

The previous prime is 1621554492023. The next prime is 1621554492133. The reversal of 1621554492060 is 602944551261.

1621554492060 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 554 + 4 + 92 + 0 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1621554491997 and 1621554492015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1181029534 + ... + 1181030906.

It is an arithmetic number, because the mean of its divisors is an integer number (11458558188).

Almost surely, 2^{1621554492060} is an apocalyptic number.

1621554492060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621554492060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2750053965120).

1621554492060 is an abundant number, since it is smaller than the sum of its proper divisors (3878553438180).

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

1621554492060 is a wasteful number, since it uses less digits than its factorization.

1621554492060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539 (or 2528 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 1621554492060 in words is "one trillion, six hundred twenty-one billion, five hundred fifty-four million, four hundred ninety-two thousand, sixty".