61667481 has 4 divisors (see below), whose sum is σ = 82223312. Its totient is φ = 41111652.

The previous prime is 61667471. The next prime is 61667503. The reversal of 61667481 is 18476616.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61667481 - 2²² = 57473177 is a prime.

It is a super-2 number, since 2×61667481² = 7605756425770722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61667471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10277911 + ... + 10277916.

It is an arithmetic number, because the mean of its divisors is an integer number (20555828).

Almost surely, 2^61667481 is an apocalyptic number.

It is an amenable number.

61667481 is a deficient number, since it is larger than the sum of its proper divisors (20555831).

61667481 is a wasteful number, since it uses less digits than its factorization.

61667481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20555830.

The product of its digits is 48384, while the sum is 39.

The square root of 61667481 is about 7852.8645092094. The cubic root of 61667481 is about 395.0803254898.

The spelling of 61667481 in words is "sixty-one million, six hundred sixty-seven thousand, four hundred eighty-one".