2155224146405 has 48 divisors (see below), whose sum is σ = 3043800834480. Its totient is φ = 1458657361920.

The previous prime is 2155224146393. The next prime is 2155224146417. The reversal of 2155224146405 is 5046414225512.

It is an interprime number because it is at equal distance from previous prime (2155224146393) and next prime (2155224146417).

It can be written as a sum of positive squares in 8 ways, for example, as 3704304769 + 2151519841636 = 60863^2 + 1466806^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2155224146405 is a prime.

It is a super-2 number, since 2×2155224146405² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 261884 + ... + 2092613.

It is an arithmetic number, because the mean of its divisors is an integer number (63412517385).

Almost surely, 2^{2155224146405} is an apocalyptic number.

It is an amenable number.

2155224146405 is a deficient number, since it is larger than the sum of its proper divisors (888576688075).

2155224146405 is a wasteful number, since it uses less digits than its factorization.

2155224146405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354630 (or 2354619 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 41.

The spelling of 2155224146405 in words is "two trillion, one hundred fifty-five billion, two hundred twenty-four million, one hundred forty-six thousand, four hundred five".