661060155 has 16 divisors (see below), whose sum is σ = 1208795904. Its totient is φ = 302198880.

The previous prime is 661060139. The next prime is 661060157. The reversal of 661060155 is 551060166.

It is not a de Polignac number, because 661060155 - 2⁴ = 661060139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661060157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3147801 + ... + 3148010.

It is an arithmetic number, because the mean of its divisors is an integer number (75549744).

Almost surely, 2^661060155 is an apocalyptic number.

661060155 is a deficient number, since it is larger than the sum of its proper divisors (547735749).

661060155 is a wasteful number, since it uses less digits than its factorization.

661060155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295826.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 661060155 is about 25711.0901169126. The cubic root of 661060155 is about 871.1246981409.

The spelling of 661060155 in words is "six hundred sixty-one million, sixty thousand, one hundred fifty-five".