1661115410 has 32 divisors (see below), whose sum is σ = 3085396272. Its totient is φ = 643486720.

The previous prime is 1661115409. The next prime is 1661115431. The reversal of 1661115410 is 145111661.

It can be written as a sum of positive squares in 8 ways, for example, as 117961321 + 1543154089 = 10861^2 + 39283^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1661115410.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41384 + ... + 70956.

Almost surely, 2^1661115410 is an apocalyptic number.

1661115410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661115410 is a deficient number, since it is larger than the sum of its proper divisors (1424280862).

1661115410 is a wasteful number, since it uses less digits than its factorization.

1661115410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29758.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1661115410 is about 40756.7836071494. The cubic root of 1661115410 is about 1184.3132887974.

The spelling of 1661115410 in words is "one billion, six hundred sixty-one million, one hundred fifteen thousand, four hundred ten".