61431805550 has 24 divisors (see below), whose sum is σ = 114274103400. Its totient is φ = 24570368480.

The previous prime is 61431805543. The next prime is 61431805573. The reversal of 61431805550 is 5550813416.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 525896 + ... + 632004.

It is an arithmetic number, because the mean of its divisors is an integer number (4761420975).

Almost surely, 2^61431805550 is an apocalyptic number.

61431805550 is a deficient number, since it is larger than the sum of its proper divisors (52842297850).

61431805550 is a wasteful number, since it uses less digits than its factorization.

61431805550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117700 (or 117695 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 61431805550 in words is "sixty-one billion, four hundred thirty-one million, eight hundred five thousand, five hundred fifty".