31657703642 has 4 divisors (see below), whose sum is σ = 47486555466. Its totient is φ = 15828851820.

The previous prime is 31657703611. The next prime is 31657703647. The reversal of 31657703642 is 24630775613.

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

It can be written as a sum of positive squares in only one way, i.e., 16481681161 + 15176022481 = 128381^2 + 123191^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31657703593 and 31657703602.

It is not an unprimeable number, because it can be changed into a prime (31657703647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7914425909 + ... + 7914425912.

Almost surely, 2^31657703642 is an apocalyptic number.

31657703642 is a deficient number, since it is larger than the sum of its proper divisors (15828851824).

31657703642 is a wasteful number, since it uses less digits than its factorization.

31657703642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15828851823.

The product of its (nonzero) digits is 635040, while the sum is 44.

The spelling of 31657703642 in words is "thirty-one billion, six hundred fifty-seven million, seven hundred three thousand, six hundred forty-two".