1661707155 has 8 divisors (see below), whose sum is σ = 2658731472. Its totient is φ = 886243808.

The previous prime is 1661707147. The next prime is 1661707169. The reversal of 1661707155 is 5517071661.

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

It is a cyclic number.

It is not a de Polignac number, because 1661707155 - 2³ = 1661707147 is a prime.

It is a super-2 number, since 2×1661707155² = 5522541337956388050, which contains 22 as substring.

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, 55390224 + ... + 55390253.

It is an arithmetic number, because the mean of its divisors is an integer number (332341434).

Almost surely, 2^1661707155 is an apocalyptic number.

1661707155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661707155 is a deficient number, since it is larger than the sum of its proper divisors (997024317).

1661707155 is a wasteful number, since it uses less digits than its factorization.

1661707155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110780485.

The product of its (nonzero) digits is 44100, while the sum is 39.

The square root of 1661707155 is about 40764.0424271195. The cubic root of 1661707155 is about 1184.4539028012.

The spelling of 1661707155 in words is "one billion, six hundred sixty-one million, seven hundred seven thousand, one hundred fifty-five".