2151620066551 has 8 divisors (see below), whose sum is σ = 2251452197504. Its totient is φ = 2053689500160.

The previous prime is 2151620066417. The next prime is 2151620066669. The reversal of 2151620066551 is 1556600261512.

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

It is a cyclic number.

It is not a de Polignac number, because 2151620066551 - 2¹⁹ = 2151619542263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151620066051) 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, 475388826 + ... + 475393351.

It is an arithmetic number, because the mean of its divisors is an integer number (281431524688).

Almost surely, 2^{2151620066551} is an apocalyptic number.

2151620066551 is a deficient number, since it is larger than the sum of its proper divisors (99832130953).

2151620066551 is an equidigital number, since it uses as much as digits as its factorization.

2151620066551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950782281.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 2151620066551 in words is "two trillion, one hundred fifty-one billion, six hundred twenty million, sixty-six thousand, five hundred fifty-one".