61661504 has 14 divisors (see below), whose sum is σ = 122359674. Its totient is φ = 30830720.

The previous prime is 61661503. The next prime is 61661513. The reversal of 61661504 is 40516616.

It can be written as a sum of positive squares in only one way, i.e., 37847104 + 23814400 = 6152^2 + 4880^2 .

It is a super-3 number, since 3×61661504³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61661503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 481667 + ... + 481794.

Almost surely, 2^61661504 is an apocalyptic number.

61661504 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61661504 is a deficient number, since it is larger than the sum of its proper divisors (60698170).

61661504 is an equidigital number, since it uses as much as digits as its factorization.

61661504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963473 (or 963463 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 61661504 is about 7852.4839382198. The cubic root of 61661504 is about 395.0675609481.

The spelling of 61661504 in words is "sixty-one million, six hundred sixty-one thousand, five hundred four".