31566232623661 has 4 divisors (see below), whose sum is σ = 31568026482972. Its totient is φ = 31564438764352.

The previous prime is 31566232623641. The next prime is 31566232623697. The reversal of 31566232623661 is 16632623266513.

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

It can be written as a sum of positive squares in 2 ways, for example, as 811377585225 + 30754855038436 = 900765^2 + 5545706^2 .

It is a cyclic number.

It is not a de Polignac number, because 31566232623661 - 2¹³ = 31566232615469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31566232623599 and 31566232623608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31566232623631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 896903260 + ... + 896938453.

It is an arithmetic number, because the mean of its divisors is an integer number (7892006620743).

Almost surely, 2^{31566232623661} is an apocalyptic number.

It is an amenable number.

31566232623661 is a deficient number, since it is larger than the sum of its proper divisors (1793859311).

31566232623661 is a wasteful number, since it uses less digits than its factorization.

31566232623661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793859310.

The product of its digits is 8398080, while the sum is 52.

The spelling of 31566232623661 in words is "thirty-one trillion, five hundred sixty-six billion, two hundred thirty-two million, six hundred twenty-three thousand, six hundred sixty-one".