61563557 has 8 divisors (see below), whose sum is σ = 67269792. Its totient is φ = 55875600.

The previous prime is 61563533. The next prime is 61563559. The reversal of 61563557 is 75536516.

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

It is not a de Polignac number, because 61563557 - 2²² = 57369253 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 61563557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61563559) 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, 3038 + ... + 11504.

It is an arithmetic number, because the mean of its divisors is an integer number (8408724).

Almost surely, 2^61563557 is an apocalyptic number.

It is an amenable number.

61563557 is a deficient number, since it is larger than the sum of its proper divisors (5706235).

61563557 is a wasteful number, since it uses less digits than its factorization.

61563557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9139.

The product of its digits is 94500, while the sum is 38.

The square root of 61563557 is about 7846.2447705893. The cubic root of 61563557 is about 394.8582667269.

The spelling of 61563557 in words is "sixty-one million, five hundred sixty-three thousand, five hundred fifty-seven".