151821216605 has 8 divisors (see below), whose sum is σ = 182981031000. Its totient is φ = 120926592576.

The previous prime is 151821216553. The next prime is 151821216619. The reversal of 151821216605 is 506612128151.

It can be written as a sum of positive squares in 4 ways, for example, as 81533662681 + 70287553924 = 285541^2 + 265118^2 .

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 151821216605 - 2²⁰ = 151820168029 is a prime.

It is a super-2 number, since 2×151821216605² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66296330 + ... + 66298619.

It is an arithmetic number, because the mean of its divisors is an integer number (22872628875).

Almost surely, 2^151821216605 is an apocalyptic number.

It is an amenable number.

151821216605 is a deficient number, since it is larger than the sum of its proper divisors (31159814395).

151821216605 is a wasteful number, since it uses less digits than its factorization.

151821216605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132595183.

The product of its (nonzero) digits is 28800, while the sum is 38.

The spelling of 151821216605 in words is "one hundred fifty-one billion, eight hundred twenty-one million, two hundred sixteen thousand, six hundred five".