31661484782 has 4 divisors (see below), whose sum is σ = 47492227176. Its totient is φ = 15830742390.

The previous prime is 31661484781. The next prime is 31661484787. The reversal of 31661484782 is 28748416613.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31661484782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661484781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7915371194 + ... + 7915371197.

It is an arithmetic number, because the mean of its divisors is an integer number (11873056794).

Almost surely, 2^31661484782 is an apocalyptic number.

31661484782 is a deficient number, since it is larger than the sum of its proper divisors (15830742394).

31661484782 is a wasteful number, since it uses less digits than its factorization.

31661484782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15830742393.

The product of its digits is 1548288, while the sum is 50.

The spelling of 31661484782 in words is "thirty-one billion, six hundred sixty-one million, four hundred eighty-four thousand, seven hundred eighty-two".