661154 has 16 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 299280.

The previous prime is 661139. The next prime is 661183. The reversal of 661154 is 451166.

It is a super-2 number, since 2×661154² = 874249223432, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 661154.

It is an unprimeable number.

661154 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1319 + ... + 1749.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2⁶⁶¹¹⁵⁴ is an apocalyptic number.

661154 is a deficient number, since it is larger than the sum of its proper divisors (427486).

661154 is a wasteful number, since it uses less digits than its factorization.

661154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505.

The product of its digits is 720, while the sum is 23.

The square root of 661154 is about 813.1137681776. The cubic root of 661154 is about 87.1165918207.

The spelling of 661154 in words is "six hundred sixty-one thousand, one hundred fifty-four".