1661062155 has 16 divisors (see below), whose sum is σ = 2659877664. Its totient is φ = 885173760.

The previous prime is 1661062141. The next prime is 1661062157. The reversal of 1661062155 is 5512601661.

It is not a de Polignac number, because 1661062155 - 2¹² = 1661058059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661062157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26206 + ... + 63315.

It is an arithmetic number, because the mean of its divisors is an integer number (166242354).

Almost surely, 2^1661062155 is an apocalyptic number.

1661062155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661062155 is a deficient number, since it is larger than the sum of its proper divisors (998815509).

1661062155 is a wasteful number, since it uses less digits than its factorization.

1661062155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90766.

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

The square root of 1661062155 is about 40756.1302750887. The cubic root of 1661062155 is about 1184.3006323863.

The spelling of 1661062155 in words is "one billion, six hundred sixty-one million, sixty-two thousand, one hundred fifty-five".