1646621352155 has 8 divisors (see below), whose sum is σ = 2127941439792. Its totient is φ = 1215966536928.

The previous prime is 1646621352151. The next prime is 1646621352157. The reversal of 1646621352155 is 5512531266461.

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 1646621352155 - 2² = 1646621352151 is a prime.

It is a super-2 number, since 2×1646621352155² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1646621352151) 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, 12666318029 + ... + 12666318158.

It is an arithmetic number, because the mean of its divisors is an integer number (265992679974).

Almost surely, 2^{1646621352155} is an apocalyptic number.

1646621352155 is a deficient number, since it is larger than the sum of its proper divisors (481320087637).

1646621352155 is a wasteful number, since it uses less digits than its factorization.

1646621352155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25332636205.

The product of its digits is 1296000, while the sum is 47.

The spelling of 1646621352155 in words is "one trillion, six hundred forty-six billion, six hundred twenty-one million, three hundred fifty-two thousand, one hundred fifty-five".