61699553871 has 8 divisors (see below), whose sum is σ = 83424749184. Its totient is φ = 40553697240.

The previous prime is 61699553737. The next prime is 61699553911. The reversal of 61699553871 is 17835599616.

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

It is not a de Polignac number, because 61699553871 - 2¹⁸ = 61699291727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61699551871) 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, 144834421 + ... + 144834846.

It is an arithmetic number, because the mean of its divisors is an integer number (10428093648).

Almost surely, 2^61699553871 is an apocalyptic number.

61699553871 is a deficient number, since it is larger than the sum of its proper divisors (21725195313).

61699553871 is a wasteful number, since it uses less digits than its factorization.

61699553871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289669341.

The product of its digits is 12247200, while the sum is 60.

The spelling of 61699553871 in words is "sixty-one billion, six hundred ninety-nine million, five hundred fifty-three thousand, eight hundred seventy-one".