61866802551 has 32 divisors (see below), whose sum is σ = 86220288000. Its totient is φ = 39410645120.

The previous prime is 61866802541. The next prime is 61866802567. The reversal of 61866802551 is 15520866816.

It is a cyclic number.

It is not a de Polignac number, because 61866802551 - 2¹⁷ = 61866671479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61866802551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61866802511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3264100 + ... + 3282998.

It is an arithmetic number, because the mean of its divisors is an integer number (2694384000).

Almost surely, 2^61866802551 is an apocalyptic number.

61866802551 is a deficient number, since it is larger than the sum of its proper divisors (24353485449).

61866802551 is a wasteful number, since it uses less digits than its factorization.

61866802551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19319.

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 61866802551 in words is "sixty-one billion, eight hundred sixty-six million, eight hundred two thousand, five hundred fifty-one".