1620530016655 has 24 divisors (see below), whose sum is σ = 2139241206816. Its totient is φ = 1177603078080.

The previous prime is 1620530016647. The next prime is 1620530016689. The reversal of 1620530016655 is 5566100350261.

It is not a de Polignac number, because 1620530016655 - 2³ = 1620530016647 is a prime.

It is a super-2 number, since 2×1620530016655² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 355164 + ... + 1834993.

It is an arithmetic number, because the mean of its divisors is an integer number (89135050284).

Almost surely, 2^{1620530016655} is an apocalyptic number.

1620530016655 is a deficient number, since it is larger than the sum of its proper divisors (518711190161).

1620530016655 is a wasteful number, since it uses less digits than its factorization.

1620530016655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191407 (or 2191396 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 1620530016655 in words is "one trillion, six hundred twenty billion, five hundred thirty million, sixteen thousand, six hundred fifty-five".