1655221512 has 32 divisors (see below), whose sum is σ = 4729204800. Its totient is φ = 472920384.

The previous prime is 1655221511. The next prime is 1655221543. The reversal of 1655221512 is 2151225561.

It is a super-2 number, since 2×1655221512² = 5479516507575132288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1655221512.

It is not an unprimeable number, because it can be changed into a prime (1655221511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4926087 + ... + 4926422.

It is an arithmetic number, because the mean of its divisors is an integer number (147787650).

Almost surely, 2^1655221512 is an apocalyptic number.

1655221512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1655221512 is an abundant number, since it is smaller than the sum of its proper divisors (3073983288).

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

1655221512 is a wasteful number, since it uses less digits than its factorization.

1655221512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9852525 (or 9852521 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 1655221512 is about 40684.4136248761. The cubic root of 1655221512 is about 1182.9109191136.

The spelling of 1655221512 in words is "one billion, six hundred fifty-five million, two hundred twenty-one thousand, five hundred twelve".