661222126 has 16 divisors (see below), whose sum is σ = 1027192320. Its totient is φ = 318894840.

The previous prime is 661222103. The next prime is 661222169. The reversal of 661222126 is 621222166.

It is a junction number, because it is equal to n+sod(n) for n = 661222094 and 661222103.

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, 1665 + ... + 36403.

It is an arithmetic number, because the mean of its divisors is an integer number (64199520).

Almost surely, 2^661222126 is an apocalyptic number.

661222126 is a deficient number, since it is larger than the sum of its proper divisors (365970194).

661222126 is a wasteful number, since it uses less digits than its factorization.

661222126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35079.

The product of its digits is 3456, while the sum is 28.

The square root of 661222126 is about 25714.2397515462. The cubic root of 661222126 is about 871.1958391282.

The spelling of 661222126 in words is "six hundred sixty-one million, two hundred twenty-two thousand, one hundred twenty-six".