61853540991 has 32 divisors (see below), whose sum is σ = 92235580416. Its totient is φ = 36543936000.

The previous prime is 61853540941. The next prime is 61853540999. The reversal of 61853540991 is 19904535816.

It is not a de Polignac number, because 61853540991 - 2¹⁰ = 61853539967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61853540999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1770010 + ... + 1804616.

It is an arithmetic number, because the mean of its divisors is an integer number (2882361888).

Almost surely, 2^61853540991 is an apocalyptic number.

61853540991 is a deficient number, since it is larger than the sum of its proper divisors (30382039425).

61853540991 is a wasteful number, since it uses less digits than its factorization.

61853540991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35983.

The product of its (nonzero) digits is 1166400, while the sum is 51.

It can be divided in two parts, 618535 and 40991, that added together give a triangular number (659526 = T₁₁₄₈).

The spelling of 61853540991 in words is "sixty-one billion, eight hundred fifty-three million, five hundred forty thousand, nine hundred ninety-one".