1655116572021 has 8 divisors (see below), whose sum is σ = 2407442286624. Its totient is φ = 1003100952720.

The previous prime is 1655116572017. The next prime is 1655116572061. The reversal of 1655116572021 is 1202756115561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1655116572021 - 2² = 1655116572017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655116572061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25077523786 + ... + 25077523851.

It is an arithmetic number, because the mean of its divisors is an integer number (300930285828).

Almost surely, 2^{1655116572021} is an apocalyptic number.

1655116572021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1655116572021 is a deficient number, since it is larger than the sum of its proper divisors (752325714603).

1655116572021 is a wasteful number, since it uses less digits than its factorization.

1655116572021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50155047651.

The product of its (nonzero) digits is 126000, while the sum is 42.

The spelling of 1655116572021 in words is "one trillion, six hundred fifty-five billion, one hundred sixteen million, five hundred seventy-two thousand, twenty-one".