61672165 has 4 divisors (see below), whose sum is σ = 74006604. Its totient is φ = 49337728.

The previous prime is 61672151. The next prime is 61672189. The reversal of 61672165 is 56127616.

It is a happy number.

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 49098049 + 12574116 = 7007^2 + 3546^2 .

It is a cyclic number.

It is not a de Polignac number, because 61672165 - 2⁵ = 61672133 is a prime.

It is an alternating number because its digits alternate between even and odd.

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 61672165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6167212 + ... + 6167221.

It is an arithmetic number, because the mean of its divisors is an integer number (18501651).

Almost surely, 2^61672165 is an apocalyptic number.

It is an amenable number.

61672165 is a deficient number, since it is larger than the sum of its proper divisors (12334439).

61672165 is a wasteful number, since it uses less digits than its factorization.

61672165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12334438.

The product of its digits is 15120, while the sum is 34.

The square root of 61672165 is about 7853.1627386678. The cubic root of 61672165 is about 395.0903281112.

The spelling of 61672165 in words is "sixty-one million, six hundred seventy-two thousand, one hundred sixty-five".