61642553 has 8 divisors (see below), whose sum is σ = 73511808. Its totient is φ = 50539104.

The previous prime is 61642541. The next prime is 61642571. The reversal of 61642553 is 35524616.

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

It is not a de Polignac number, because 61642553 - 2⁸ = 61642297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61642583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191276 + ... + 191597.

It is an arithmetic number, because the mean of its divisors is an integer number (9188976).

Almost surely, 2^61642553 is an apocalyptic number.

It is an amenable number.

61642553 is a deficient number, since it is larger than the sum of its proper divisors (11869255).

61642553 is a wasteful number, since it uses less digits than its factorization.

61642553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382903.

The product of its digits is 21600, while the sum is 32.

The square root of 61642553 is about 7851.2771572528. The cubic root of 61642553 is about 395.0270835459.

The spelling of 61642553 in words is "sixty-one million, six hundred forty-two thousand, five hundred fifty-three".