1661153415 has 32 divisors (see below), whose sum is σ = 2688254976. Its totient is φ = 875871360.

The previous prime is 1661153399. The next prime is 1661153441. The reversal of 1661153415 is 5143511661.

It is not a de Polignac number, because 1661153415 - 2⁴ = 1661153399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 495234 + ... + 498576.

It is an arithmetic number, because the mean of its divisors is an integer number (84007968).

Almost surely, 2^1661153415 is an apocalyptic number.

1661153415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661153415 is a deficient number, since it is larger than the sum of its proper divisors (1027101561).

1661153415 is a wasteful number, since it uses less digits than its factorization.

1661153415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719.

The product of its digits is 10800, while the sum is 33.

The square root of 1661153415 is about 40757.2498458863. The cubic root of 1661153415 is about 1184.3223207773.

The spelling of 1661153415 in words is "one billion, six hundred sixty-one million, one hundred fifty-three thousand, four hundred fifteen".