1661132465 has 8 divisors (see below), whose sum is σ = 1993599528. Its totient is φ = 1328745600.

The previous prime is 1661132453. The next prime is 1661132471. The reversal of 1661132465 is 5642311661.

It can be written as a sum of positive squares in 4 ways, for example, as 833534641 + 827597824 = 28871^2 + 28768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1661132465 is a prime.

It is a super-2 number, since 2×1661132465² = 5518722132553952450, which contains 22 as substring.

It is a Duffinian 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, 44309 + ... + 72701.

It is an arithmetic number, because the mean of its divisors is an integer number (249199941).

Almost surely, 2^1661132465 is an apocalyptic number.

It is an amenable number.

1661132465 is a deficient number, since it is larger than the sum of its proper divisors (332467063).

1661132465 is a wasteful number, since it uses less digits than its factorization.

1661132465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40099.

The product of its digits is 25920, while the sum is 35.

The square root of 1661132465 is about 40756.9928355859. The cubic root of 1661132465 is about 1184.3173419763.

The spelling of 1661132465 in words is "one billion, six hundred sixty-one million, one hundred thirty-two thousand, four hundred sixty-five".