1651161166 has 4 divisors (see below), whose sum is σ = 2476741752. Its totient is φ = 825580582.

The previous prime is 1651161157. The next prime is 1651161167. The reversal of 1651161166 is 6611611561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6611611561 = 70039 ⋅94399.

It is a super-2 number, since 2×1651161166² = 5452666392212959112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651161167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412790290 + ... + 412790293.

It is an arithmetic number, because the mean of its divisors is an integer number (619185438).

Almost surely, 2^1651161166 is an apocalyptic number.

1651161166 is a deficient number, since it is larger than the sum of its proper divisors (825580586).

1651161166 is an equidigital number, since it uses as much as digits as its factorization.

1651161166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825580585.

The product of its digits is 6480, while the sum is 34.

The square root of 1651161166 is about 40634.4824748636. The cubic root of 1651161166 is about 1181.9428794272.

It can be divided in two parts, 16511 and 61166, that added together give a palindrome (77677).

The spelling of 1651161166 in words is "one billion, six hundred fifty-one million, one hundred sixty-one thousand, one hundred sixty-six".