61659473 has 6 divisors (see below), whose sum is σ = 62151042. Its totient is φ = 61171760.

The previous prime is 61659469. The next prime is 61659487. The reversal of 61659473 is 37495616.

It can be written as a sum of positive squares in only one way, i.e., 48205249 + 13454224 = 6943^2 + 3668^2 .

It is not a de Polignac number, because 61659473 - 2² = 61659469 is a prime.

It is a super-2 number, since 2×61659473² = 7603781221275458, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61659473.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61659413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15365 + ... + 18957.

It is an arithmetic number, because the mean of its divisors is an integer number (10358507).

Almost surely, 2^61659473 is an apocalyptic number.

It is an amenable number.

61659473 is a deficient number, since it is larger than the sum of its proper divisors (491569).

61659473 is an equidigital number, since it uses as much as digits as its factorization.

61659473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855 (or 3724 counting only the distinct ones).

The product of its digits is 136080, while the sum is 41.

The square root of 61659473 is about 7852.3546150184. The cubic root of 61659473 is about 395.0632233362.

The spelling of 61659473 in words is "sixty-one million, six hundred fifty-nine thousand, four hundred seventy-three".