61543645 has 8 divisors (see below), whose sum is σ = 73895904. Its totient is φ = 49205904.

The previous prime is 61543639. The next prime is 61543663. The reversal of 61543645 is 54634516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61543645 - 2³ = 61543637 is a prime.

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 61543645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11262 + ... + 15808.

It is an arithmetic number, because the mean of its divisors is an integer number (9236988).

Almost surely, 2^61543645 is an apocalyptic number.

It is an amenable number.

61543645 is a deficient number, since it is larger than the sum of its proper divisors (12352259).

61543645 is a wasteful number, since it uses less digits than its factorization.

61543645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7259.

The product of its digits is 43200, while the sum is 34.

The square root of 61543645 is about 7844.9757807147. The cubic root of 61543645 is about 394.8156914003.

The spelling of 61543645 in words is "sixty-one million, five hundred forty-three thousand, six hundred forty-five".