1617221754654 has 64 divisors (see below), whose sum is σ = 3555940227840. Its totient is φ = 486254912000.

The previous prime is 1617221754619. The next prime is 1617221754719. The reversal of 1617221754654 is 4564571227161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1617221754597 and 1617221754606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109701724 + ... + 109716464.

It is an arithmetic number, because the mean of its divisors is an integer number (55561566060).

Almost surely, 2^{1617221754654} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1617221754654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1777970113920).

1617221754654 is an abundant number, since it is smaller than the sum of its proper divisors (1938718473186).

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

1617221754654 is a wasteful number, since it uses less digits than its factorization.

1617221754654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27577.

The product of its digits is 2822400, while the sum is 51.

The spelling of 1617221754654 in words is "one trillion, six hundred seventeen billion, two hundred twenty-one million, seven hundred fifty-four thousand, six hundred fifty-four".