61556651 has 4 divisors (see below), whose sum is σ = 66291792. Its totient is φ = 56821512.

The previous prime is 61556639. The next prime is 61556659. The reversal of 61556651 is 15665516.

61556651 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61556651 - 2⁶ = 61556587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61556659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2367551 + ... + 2367576.

It is an arithmetic number, because the mean of its divisors is an integer number (16572948).

Almost surely, 2^61556651 is an apocalyptic number.

61556651 is a deficient number, since it is larger than the sum of its proper divisors (4735141).

61556651 is a wasteful number, since it uses less digits than its factorization.

61556651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4735140.

The product of its digits is 27000, while the sum is 35.

The square root of 61556651 is about 7845.8046751114. The cubic root of 61556651 is about 394.8435015352.

The spelling of 61556651 in words is "sixty-one million, five hundred fifty-six thousand, six hundred fifty-one".