1661060555 has 48 divisors (see below), whose sum is σ = 2537256960. Its totient is φ = 1032292800.

The previous prime is 1661060519. The next prime is 1661060581. The reversal of 1661060555 is 5550601661.

It is not a de Polignac number, because 1661060555 - 2¹² = 1661056459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1128470 + ... + 1129940.

It is an arithmetic number, because the mean of its divisors is an integer number (52859520).

Almost surely, 2^1661060555 is an apocalyptic number.

1661060555 is a deficient number, since it is larger than the sum of its proper divisors (876196405).

1661060555 is a wasteful number, since it uses less digits than its factorization.

1661060555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920 (or 1913 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1661060555 is about 40756.1106461350. The cubic root of 1661060555 is about 1184.3002521313.

The spelling of 1661060555 in words is "one billion, six hundred sixty-one million, sixty thousand, five hundred fifty-five".