1661455210 has 16 divisors (see below), whose sum is σ = 2991234600. Its totient is φ = 664445376.

The previous prime is 1661455193. The next prime is 1661455219. The reversal of 1661455210 is 125541661.

It can be written as a sum of positive squares in 4 ways, for example, as 914034289 + 747420921 = 30233^2 + 27339^2 .

It is a super-2 number, since 2×1661455210² = 5520866829672288200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661455219) 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, 44536 + ... + 72844.

Almost surely, 2^1661455210 is an apocalyptic number.

1661455210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661455210 is a deficient number, since it is larger than the sum of its proper divisors (1329779390).

1661455210 is a wasteful number, since it uses less digits than its factorization.

1661455210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34185.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1661455210 is about 40760.9520251920. The cubic root of 1661455210 is about 1184.3940381974.

Adding to 1661455210 its reverse (125541661), we get a palindrome (1786996871).

It can be divided in two parts, 16614 and 55210, that added together give a square (71824 = 268²).

The spelling of 1661455210 in words is "one billion, six hundred sixty-one million, four hundred fifty-five thousand, two hundred ten".