661654155 has 8 divisors (see below), whose sum is σ = 1058646672. Its totient is φ = 352882208.

The previous prime is 661654153. The next prime is 661654159. The reversal of 661654155 is 551456166.

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 661654155 - 2¹ = 661654153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661654153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22055124 + ... + 22055153.

It is an arithmetic number, because the mean of its divisors is an integer number (132330834).

Almost surely, 2^661654155 is an apocalyptic number.

661654155 is a deficient number, since it is larger than the sum of its proper divisors (396992517).

661654155 is a wasteful number, since it uses less digits than its factorization.

661654155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44110285.

The product of its digits is 108000, while the sum is 39.

The square root of 661654155 is about 25722.6389587072. The cubic root of 661654155 is about 871.3855383275.

The spelling of 661654155 in words is "six hundred sixty-one million, six hundred fifty-four thousand, one hundred fifty-five".