2155620466 has 4 divisors (see below), whose sum is σ = 3233430702. Its totient is φ = 1077810232.

The previous prime is 2155620463. The next prime is 2155620491. The reversal of 2155620466 is 6640265512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1544097025 + 611523441 = 39295^2 + 24729^2 .

It is not an unprimeable number, because it can be changed into a prime (2155620463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538905115 + ... + 538905118.

Almost surely, 2^2155620466 is an apocalyptic number.

2155620466 is a deficient number, since it is larger than the sum of its proper divisors (1077810236).

2155620466 is a wasteful number, since it uses less digits than its factorization.

2155620466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077810235.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 2155620466 is about 46428.6599634321. The cubic root of 2155620466 is about 1291.7865728955.

Adding to 2155620466 its reverse (6640265512), we get a palindrome (8795885978).

The spelling of 2155620466 in words is "two billion, one hundred fifty-five million, six hundred twenty thousand, four hundred sixty-six".