1661625106 has 16 divisors (see below), whose sum is σ = 2504893248. Its totient is φ = 826670800.

The previous prime is 1661625089. The next prime is 1661625109. The reversal of 1661625106 is 6015261661.

It is a happy number.

It is a super-2 number, since 2×1661625106² = 5521995985779022472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661625109) 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, 404121 + ... + 408211.

It is an arithmetic number, because the mean of its divisors is an integer number (156555828).

Almost surely, 2^1661625106 is an apocalyptic number.

1661625106 is a deficient number, since it is larger than the sum of its proper divisors (843268142).

1661625106 is a wasteful number, since it uses less digits than its factorization.

1661625106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1661625106 is about 40763.0360253012. The cubic root of 1661625106 is about 1184.4344078183.

Adding to 1661625106 its reverse (6015261661), we get a palindrome (7676886767).

The spelling of 1661625106 in words is "one billion, six hundred sixty-one million, six hundred twenty-five thousand, one hundred six".