61661154 has 32 divisors (see below), whose sum is σ = 127008000. Its totient is φ = 19948032.

The previous prime is 61661153. The next prime is 61661161. The reversal of 61661154 is 45116616.

It is a super-2 number, since 2×61661154² = 7604195825223432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61661153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29847 + ... + 31845.

It is an arithmetic number, because the mean of its divisors is an integer number (3969000).

Almost surely, 2^61661154 is an apocalyptic number.

61661154 is an abundant number, since it is smaller than the sum of its proper divisors (65346846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61661154 is a wasteful number, since it uses less digits than its factorization.

61661154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154.

The product of its digits is 4320, while the sum is 30.

The square root of 61661154 is about 7852.4616522464. The cubic root of 61661154 is about 395.0668134590.

The spelling of 61661154 in words is "sixty-one million, six hundred sixty-one thousand, one hundred fifty-four".