61662401 has 4 divisors (see below), whose sum is σ = 63166404. Its totient is φ = 60158400.

The previous prime is 61662397. The next prime is 61662409. The reversal of 61662401 is 10426616.

It is a happy number.

61662401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9461776 + 52200625 = 3076^2 + 7225^2 .

It is a cyclic number.

It is not a de Polignac number, because 61662401 - 2² = 61662397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61662409) 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 3 ways as a sum of consecutive naturals, for example, 751940 + ... + 752021.

It is an arithmetic number, because the mean of its divisors is an integer number (15791601).

Almost surely, 2^61662401 is an apocalyptic number.

It is an amenable number.

61662401 is a deficient number, since it is larger than the sum of its proper divisors (1504003).

61662401 is a wasteful number, since it uses less digits than its factorization.

61662401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504002.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 61662401 is about 7852.5410536972. The cubic root of 61662401 is about 395.0694766430.

The spelling of 61662401 in words is "sixty-one million, six hundred sixty-two thousand, four hundred one".